Re: [X2Go-User] nxagent

[Stefan Baur]

Am 07.03.2018 um 01:45 schrieb Robert Dinse:

>  What I do:
> 
> apt purge nx* libnx* *x2go*

That does not sound clever.
"purge" also removes config files, which may not be what you want,
especially if you made custom changes to any of them.  A simple "remove"
will leave them in place (status "rc" when checking "dpkg -l" output),
so a new installation (no matter which version) can pick up on them.

Anyways, if you're in this mess on a production system, because you
chose to ignore our previous warning [0] about switching to saimaa or
disabling auto-updates, and don't have a proper backup, either, then at
least make sure to back up /etc/x2go/ *before* running a "purge" command.

Kind Regards,
Stefan Baur

[0] http://lists.x2go.org/pipermail/x2go-user/2018-February/004836.html

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[X2Go-User] SOLVED Re: x2go server closes the inactive connection and not possible to connect again

[Pongrácz István]

xset in command line or put into .profile did the trick. X2go is up and
running as expected.
Details: https://github.com/ArcticaProject/nx-libs/issues/671
The command itself:
 /usr/bin/xset -dpms s off s noblank s 0 0 s noexpose -dpms

Reason: it seems mate control panel settings regarding dpms is not
working, that is why it is necessary to do this with xset.

Bye,
István
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[X2Go-User] SSH error with pyhoca-gui

[Michael Eager]

I'm seeing a message saying "SSH Error" with pyhoca-gui when connecting
to a CentOS 7 server.  The message in /var/log/secure on the server is
  Connection closed by 192.168.20.12 port 36098 [preauth]

I can log in to the server using SSH, and I am able to connect using
pyhoca-cli and x2goclient.  The profile specifies a shared id_rsa key.

On the server:
  x2goserver-4.0.1.20-1.el7.x86_64

On the client:
  x2goclient-4.1.1.0-1.fc27.x86_64
  python2-x2go-0.5.0.5-2.fc27.noarch
  pyhoca-gui-0.5.0.6-4.fc27.noarch
  pyhoca-cli-0.5.0.3-5.fc27.noarch

How can I tell what pyhoca-gui is doing differently/incorrectly?

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Re: [X2Go-User] nxagent

[Robert Dinse]

 What I do:

apt purge nx* libnx* *x2go*
apt autoremove

 Change repos

apt clean all # purge the cache
apt install x2goserver  --install-suggests --install-recommends

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On Tue, 6 Mar 2018, Mario Theodoridis wrote:


Date: Tue, 6 Mar 2018 15:03:52 +0100
From: Mario Theodoridis 
To: x2go-user@lists.x2go.org
Subject: Re: [X2Go-User] nxagent

On 06/03/18 14:18, martti pitkanen wrote:


Hi,

Is there hands-on instructions how to downgrade to Saimaa in Ubuntu 
(4.13.0-)?

X2Go sessions terminate in random way.


Yes.

This is what i just did more or less following Stefans advice.


sudo mv x2go-stable-trusty.list x2go-stable-trusty.list.not
sudo add-apt-repository ppa:x2go/saimaa
sudo apt-get update

sudo apt-get remove libnx-x11-6:i386 nxagent nxproxy nx-x11-common x2goclient 
x2goserver* libx2go-log-perl libx2go-server-db-perl libx2go-server-perl 
libxcomp3:i386 libxcompshad3:i386

sudo apt-get install x2goserver x2goserver-xsession

This leaves me with

 dpkg -l | egrep "(x2go|nx)" | sort
ii  libjs-sphinxdoc 1.2.2+dfsg-1ubuntu1.1    all  
JavaScript support for Sphinx documentation
ii  libnx-x11-6:i386 2:3.5.0.33-0~201711080756~ubuntu14.04.1  
i386 nx-X11 client-side library
ii  libnx-xcomposite1:i386 2:3.5.0.33-0~201711080756~ubuntu14.04.1  
i386 nx-X11 Composite extension library
ii  libnx-xdamage1:i386 2:3.5.0.33-0~201711080756~ubuntu14.04.1  
i386 nx-X11 damaged region extension library
ii  libnx-xdmcp6:i386 2:3.5.0.33-0~201711080756~ubuntu14.04.1  
i386 nx-X11 Display Manager Control Protocol library
ii  libnx-xext6:i386 2:3.5.0.33-0~201711080756~ubuntu14.04.1  
i386 nx-X11 miscellaneous extension library
ii  libnx-xfixes3:i386 2:3.5.0.33-0~201711080756~ubuntu14.04.1  
i386 nx-X11 miscellaneous 'fixes' extension library
ii  libnx-xinerama1:i386 2:3.5.0.33-0~201711080756~ubuntu14.04.1  
i386 nx-X11 Xinerama extension library
ii  libnx-xpm4:i386 2:3.5.0.33-0~201711080756~ubuntu14.04.1  i386 
nx-X11 pixmap library
ii  libnx-xrandr2:i386 2:3.5.0.33-0~201711080756~ubuntu14.04.1  
i386 nx-X11 RandR extension library
ii  libnx-xrender1:i386 2:3.5.0.33-0~201711080756~ubuntu14.04.1  
i386 nx-X11 Rendering Extension client library
ii  libnx-xtst6:i386 2:3.5.0.33-0~201711080756~ubuntu14.04.1  
i386 nx-X11 Testing -- Record extension library
ii  libxcomp3:i386 2:3.5.0.33-0~201711080756~ubuntu14.04.1  i386 
nx-X11 compression library
ii  libxcompext3:i386 2:3.5.0.33-0~201711080756~ubuntu14.04.1  
i386 nx-X11 protocol compression extensions library
ii  libxcompshad3:i386 2:3.5.0.33-0~201711080756~ubuntu14.04.1  
i386 nx-X11 shadowing library
ii  nxagent 2:3.5.0.33-0~201711080756~ubuntu14.04.1  i386 NX 
agent
ii  nx-x11-common 2:3.5.0.33-0~201711080756~ubuntu14.04.1  all  
nx-X11 (common files)
ii  qtcreator-plugin-qnx:i386 3.0.1+14.04.20140410.1-0ubuntu1  
i386 QNX plugin for Qt Creator IDE
ii  x2goagent 2:3.5.0.33-0~201711080756~ubuntu14.04.1  all  X2Go 
agent
ii  x2goserver 4.0.1.21-0~201711081403~ubuntu14.04.1    i386 X2Go 
server daemon scripts
ii  x2goserver-extensions 4.0.1.21-0~201711081403~ubuntu14.04.1    
all  X2Go server daemon scripts (extensions)
ii  x2goserver-xsession 4.0.1.21-0~201711081403~ubuntu14.04.1    
all  X2Go server daemon scripts (Xsession runner)
rc  libx2go-server-db-perl 4.1.0.0-0~1517~ubuntu14.04.1 
i386 Perl X2Go::Server:DB package
rc  x2goclient 4.1.1.1-0~1719~ubuntu14.04.1 i386 X2Go 
Client application (Qt4)
rc  x2goserver-common 4.1.0.0-0~1517~ubuntu14.04.1 
i386 X2Go Server (common files)
rc  x2goserver-fmbindings 4.1.0.0-0~1517~ubuntu14.04.1 
all  X2Go Server (file manager bindings)
rc  x2goserver-printing 4.1.0.0-0~1517~ubuntu14.04.1 
all  X2Go server (printing support)
rc  x2goserver-x2goagent 4.1.0.0-0~1517~ubuntu14.04.1 
all  X2Go Server's X2Go Agent


Unfortunately i can no longer connect. It connects then disconnects.
This is the session log

$ cat /tmp/.x2go-mario/C-mario-56-1520344207_stDKDE_dp24/session.log

running as X2Go Agent

NXAGENT - Version 3.5.0

Copyright (C) 2001, 2011 NoMachine.
See http://www.nomachine.com/ for more information.

Info: Agent running with pid '6173'.
Session: Starting session at 'Tue Mar  6 14:50:08 2018'.
Info: Proxy running in server mode with pid '6173'.

Re: [X2Go-User] x2go server closes the inactive connection and not possible to connect again

[Pongracz Istvan]

In additional, here you can see the installed nx packages:
ii  libnx-x11-6:i386
 2:3.5.99.14-0~816~ubuntu16.04.1  i386 nxagent's
libNX_X11 client-part library
ii  nx-x11-common
2:3.5.99.14-0~816~ubuntu16.04.1  all  nx-X11 (common
files)
ii  nxagent
2:3.5.99.14-0~816~ubuntu16.04.1  i386 Nested Xserver
(aka NX Agent) supporting the NX compression protocol
ii  nxproxy
2:3.5.99.14-0~816~ubuntu16.04.1  i386 NX proxy


2018-03-06 19:09 GMT+01:00 Pongrácz István :

> Hi,
>
> I use x2go successfully for several years and I very like it, thank you!
>
> I have a problem with the latest x2go (http://ppa.launchpad.net/
> x2go/stable/ubuntu xenial main).
> I can login without problem to the server, working as expected, but when I
> do not work on the x2go session (inactive or idle), the server closes the
> connection and it is not possible to connect again.
> Before the upgrade I had open sessions for days.
>
> Any idea? Below the technical details.
>
> *The client debug shows (short version):*
>
> x2go-DEBUG-../src/sshmasterconnection.cpp:2089> Forwarding parameters: from 
> remote ("localhost":49454) to local ("localhost":49788)
>
> x2go-DEBUG-../src/sshmasterconnection.cpp:2126> Temporary session port after 
> config file parse: 49454
>
> x2go-DEBUG-../src/sshmasterconnection.cpp:2130> Temporary session host after 
> config file parse: localhost
>
> x2go-DEBUG-../src/sshmasterconnection.cpp:2160> New channel forwarded.
>
> x2go-DEBUG-../src/sshmasterconnection.cpp:2320> "ssh_channel_write failed": 
> "Remote channel is closed"
>
> x2go-DEBUG-../src/sshprocess.cpp:472> I/O error: "ssh_channel_write failed."" 
> - Remote channel is closed" (2).
>
> x2go-DEBUG-../src/sshmasterconnection.cpp:2363> EOF sent.
>
> x2go-DEBUG-../src/sshmasterconnection.cpp:2367> Channel closed.
>
> x2go-DEBUG-../src/onmainwindow.cpp:6459> Proxy wrote on stderr: "Loop: PANIC! 
> The remote NX proxy closed the connection.
>
> Error: The remote NX proxy closed the connection.
>
> "
>
> x2go-DEBUG-../src/onmainwindow.cpp:6459> Proxy wrote on stderr: "Loop: PANIC! 
> Failure negotiating the session in stage '7'.
>
> Error: Failure negotiating the session in stage '7'.
>
> Loop: PANIC! Wrong version or invalid session authentication cookie.
>
> Error: Wrong version or invalid session authentication cookie.
>
>
> So, on the server side the port 49454 did not exist and even on the server
> I can see the session running (with ps ax), it is not possible to connect
> (The remote NX proxy closed the connection))
>
> I did not find fresh or relevant information on the net, I spent about 2
> days to figure out, but without success (purge, reinstall, xsession
> removing etc. - all done, without results)
>
> *On the server, the sshd log contains this relevant information (it is the
> pair of the client debug log above):*
>
> Mar  5 19:45:11 localhost sshd[1]: Accepted publickey for  from 
> Y.98 port 43002 ssh2: RSA SHA256:notrelevant
>
> Mar  5 19:45:11 localhost sshd[1]: pam_unix(sshd:session): session opened 
> for user username by (uid=0)
>
> Mar  5 19:45:11 localhost systemd-logind[787]: New session 9 of user username.
>
> Mar  5 19:45:22 localhost su[20438]: Successful su for username by root
>
> Mar  5 19:45:22 localhost su[20438]: + ??? root:username
>
> Mar  5 19:45:22 localhost su[20438]: pam_unix(su:session): session opened for 
> user username by (uid=0)
>
> Mar  5 19:45:22 localhost systemd-logind[787]: New session c1 of user 
> username.
>
> Mar  5 19:45:22 localhost su[20438]: pam_unix(su:session): session closed for 
> user username
>
> Mar  5 19:45:22 localhost su[20492]: Successful su for username by root
>
> Mar  5 19:45:22 localhost systemd-logind[787]: Removed session c1.
>
> Mar  5 19:45:22 localhost su[20492]: + ??? root:username
>
> Mar  5 19:45:22 localhost su[20492]: pam_unix(su:session): session opened for 
> user username by (uid=0)
>
> Mar  5 19:45:22 localhost systemd-logind[787]: New session c2 of user 
> username.
>
> Mar  5 19:45:24 localhost su[20492]: pam_unix(su:session): session closed for 
> user username
>
> Mar  5 19:45:24 localhost systemd-logind[787]: Removed session c2.
>
> Mar  5 19:45:25 localhost sshd[3615]: pam_unix(sshd:session): session closed 
> for user username
>
> Mar  5 19:45:29 localhost sshd[20011]: error: connect_to localhost port 
> 49454: failed.
>
> Mar  5 19:45:29 localhost sshd[20011]: channel_by_id: 0: bad id: channel free
>
> Mar  5 19:45:29 localhost sshd[20011]: Disconnecting: Received ieof for 
> nonexistent channel 0.
>
> Mar  5 19:45:29 localhost sshd[1]: pam_unix(sshd:session): session closed 
> for user username
>
> Mar  5 19:45:29 localhost systemd-logind[787]: Removed session 9.
>
>
> *The x2go server log from the syslog:*
> Here is the session opened first time, successfully, you can see the agent
> port (49454):
> Mar  5 18:31:11 localhost 

[X2Go-User] x2go server closes the inactive connection and not possible to connect again

[Pongrácz István]

Hi,

I use x2go successfully for several years and I very like it, thank
you!

I have a problem with the latest x2go (http://ppa.launchpad.net/x2go/st
able/ubuntu xenial main).
I can login without problem to the server, working as expected, but
when I do not work on the x2go session (inactive or idle), the server
closes the connection and it is not possible to connect again. 
Before the upgrade I had open sessions for days.

Any idea? Below the technical details.

The client debug shows (short version): 
x2go-DEBUG-../src/sshmasterconnection.cpp:2089> Forwarding parameters:
from remote ("localhost":49454) to local ("localhost":49788)
x2go-DEBUG-../src/sshmasterconnection.cpp:2126> Temporary session port
after config file parse: 49454
x2go-DEBUG-../src/sshmasterconnection.cpp:2130> Temporary session host
after config file parse: localhost
x2go-DEBUG-../src/sshmasterconnection.cpp:2160> New channel forwarded.
x2go-DEBUG-../src/sshmasterconnection.cpp:2320> "ssh_channel_write
failed": "Remote channel is closed"
x2go-DEBUG-../src/sshprocess.cpp:472> I/O error: "ssh_channel_write
failed."" - Remote channel is closed" (2).
x2go-DEBUG-../src/sshmasterconnection.cpp:2363> EOF sent.
x2go-DEBUG-../src/sshmasterconnection.cpp:2367> Channel closed.
x2go-DEBUG-../src/onmainwindow.cpp:6459> Proxy wrote on stderr: "Loop:
PANIC! The remote NX proxy closed the connection.
Error: The remote NX proxy closed the connection.
"
x2go-DEBUG-../src/onmainwindow.cpp:6459> Proxy wrote on stderr: "Loop:
PANIC! Failure negotiating the session in stage '7'.
Error: Failure negotiating the session in stage '7'.
Loop: PANIC! Wrong version or invalid session authentication cookie.
Error: Wrong version or invalid session authentication cookie.

So, on the server side the port 49454 did not exist and even on the
server I can see the session running (with ps ax), it is not possible
to connect (The remote NX proxy closed the connection))

I did not find fresh or relevant information on the net, I spent about
2 days to figure out, but without success (purge, reinstall, xsession
removing etc. - all done, without results)

On the server, the sshd log contains this relevant information (it is
the pair of the client debug log above):
Mar  5 19:45:11 localhost sshd[1]: Accepted publickey for  from
Y.98 port 43002 ssh2: RSA SHA256:notrelevant
Mar  5 19:45:11 localhost sshd[1]: pam_unix(sshd:session): session
opened for user username by (uid=0)
Mar  5 19:45:11 localhost systemd-logind[787]: New session 9 of user
username.
Mar  5 19:45:22 localhost su[20438]: Successful su for username by root
Mar  5 19:45:22 localhost su[20438]: + ??? root:username
Mar  5 19:45:22 localhost su[20438]: pam_unix(su:session): session
opened for user username by (uid=0)
Mar  5 19:45:22 localhost systemd-logind[787]: New session c1 of user
username.
Mar  5 19:45:22 localhost su[20438]: pam_unix(su:session): session
closed for user username
Mar  5 19:45:22 localhost su[20492]: Successful su for username by root
Mar  5 19:45:22 localhost systemd-logind[787]: Removed session c1.
Mar  5 19:45:22 localhost su[20492]: + ??? root:username
Mar  5 19:45:22 localhost su[20492]: pam_unix(su:session): session
opened for user username by (uid=0)
Mar  5 19:45:22 localhost systemd-logind[787]: New session c2 of user
username.
Mar  5 19:45:24 localhost su[20492]: pam_unix(su:session): session
closed for user username
Mar  5 19:45:24 localhost systemd-logind[787]: Removed session c2.
Mar  5 19:45:25 localhost sshd[3615]: pam_unix(sshd:session): session
closed for user username
Mar  5 19:45:29 localhost sshd[20011]: error: connect_to localhost port
49454: failed.
Mar  5 19:45:29 localhost sshd[20011]: channel_by_id: 0: bad id:
channel free
Mar  5 19:45:29 localhost sshd[20011]: Disconnecting: Received ieof for
nonexistent channel 0.
Mar  5 19:45:29 localhost sshd[1]: pam_unix(sshd:session): session
closed for user username
Mar  5 19:45:29 localhost systemd-logind[787]: Removed session 9.

The x2go server log from the syslog:
Here is the session opened first time, successfully, you can see the
agent port (49454):
Mar  5 18:31:11 localhost /usr/bin/x2gostartagent: creating new
session: username-50-1520271069_stDMATE_dp24
2a3a4f78ebac6c1318558ebfebb1 3799 .98 49454 49455 49456 -1 -1

In the syslog I did not find any related information about nxagent
closing, but only the unsuccessful reconnect after 1 hour and 14
minutes. First reconnect, I was able to see the session selector window
and I saw the session as running state, but I had only Suspend and
Terminate buttons active. I pushed the suspend and resume, problem
occurred.

Here are the packages on the server:
ii  cups-x2go3.0.1.3-
1all  Virtual X2Go printer
for CUPS
ii  libx2go-log-perl 4.1.0.0-
0~1517~ubuntu16.04.1 all  Perl X2Go::Log
package
ii  libx2go-server-db-perl  

Re: [X2Go-User] nxagent

[Mario Theodoridis]

On 06.03.2018 16:26, martti pitkanen wrote:


Hi Mario,

Thanks for your clear instructions, X2Go seems now to be in stable state.
Only the v-e-r-y slow  phase "Status: connecting" has returned, takes 
2-3 minutes.


I actually followed Roberts advice and went back to x2goserver-4.1. So 
far it seems to work.

I'll know more tomorrow.

--
Mit freundlichen Grüßen/Best regards

Mario Theodoridis

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Re: [X2Go-User] nxagent

[Mario Theodoridis]

On 06/03/18 15:23, Robert Kudyba wrote:

Why not just disable DPMS (Display Power Management Signaling) support?
https://github.com/ArcticaProject/nx-libs/issues/671#issuecomment-370715419

Cause i hadn't seen the comment that it worked yet.

I'll try that now and hopefully can get back to work. Thanks.

--
Mit freundlichen Grüßen/Kind regards

Mario Theodoridis

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Re: [X2Go-User] nxagent

[Robert Kudyba]

Why not just disable DPMS (Display Power Management Signaling) support?
https://github.com/ArcticaProject/nx-libs/issues/671#issuecomment-370715419

So a command like: /usr/bin/xset -dpms s off s noblank s 0 0 s noexpose
-dpms

On Tue, Mar 6, 2018 at 9:03 AM, Mario Theodoridis  wrote:

> On 06/03/18 14:18, martti pitkanen wrote:
>
> Hi,
>
> Is there hands-on instructions how to downgrade to Saimaa in Ubuntu
> (4.13.0-)?
> X2Go sessions terminate in random way.
>
> Yes.
>
> This is what i just did more or less following Stefans advice.
>
>
> sudo mv x2go-stable-trusty.list x2go-stable-trusty.list.not
> sudo add-apt-repository ppa:x2go/saimaa
> sudo apt-get update
>
> sudo apt-get remove libnx-x11-6:i386 nxagent nxproxy nx-x11-common
> x2goclient x2goserver* libx2go-log-perl libx2go-server-db-perl
> libx2go-server-perl libxcomp3:i386 libxcompshad3:i386
> sudo apt-get install x2goserver x2goserver-xsession
>
> This leaves me with
>
>  dpkg -l | egrep "(x2go|nx)" | sort
> ii  libjs-sphinxdoc
> 1.2.2+dfsg-1ubuntu1.1all  JavaScript
> support for Sphinx documentation
> ii  libnx-x11-6:i386
> 2:3.5.0.33-0~201711080756~ubuntu14.04.1  i386 nx-X11
> client-side library
> ii  libnx-xcomposite1:i386
> 2:3.5.0.33-0~201711080756~ubuntu14.04.1  i386 nx-X11
> Composite extension library
> ii  libnx-xdamage1:i386
> 2:3.5.0.33-0~201711080756~ubuntu14.04.1  i386 nx-X11 damaged
> region extension library
> ii  libnx-xdmcp6:i386
> 2:3.5.0.33-0~201711080756~ubuntu14.04.1  i386 nx-X11 Display
> Manager Control Protocol library
> ii  libnx-xext6:i386
> 2:3.5.0.33-0~201711080756~ubuntu14.04.1  i386 nx-X11
> miscellaneous extension library
> ii  libnx-xfixes3:i386
> 2:3.5.0.33-0~201711080756~ubuntu14.04.1  i386 nx-X11
> miscellaneous 'fixes' extension library
> ii  libnx-xinerama1:i386
> 2:3.5.0.33-0~201711080756~ubuntu14.04.1  i386 nx-X11 Xinerama
> extension library
> ii  libnx-xpm4:i386
> 2:3.5.0.33-0~201711080756~ubuntu14.04.1  i386 nx-X11 pixmap
> library
> ii  libnx-xrandr2:i386
> 2:3.5.0.33-0~201711080756~ubuntu14.04.1  i386 nx-X11 RandR
> extension library
> ii  libnx-xrender1:i386
> 2:3.5.0.33-0~201711080756~ubuntu14.04.1  i386 nx-X11
> Rendering Extension client library
> ii  libnx-xtst6:i386
> 2:3.5.0.33-0~201711080756~ubuntu14.04.1  i386 nx-X11 Testing
> -- Record extension library
> ii  libxcomp3:i386
> 2:3.5.0.33-0~201711080756~ubuntu14.04.1  i386 nx-X11
> compression library
> ii  libxcompext3:i386
> 2:3.5.0.33-0~201711080756~ubuntu14.04.1  i386 nx-X11 protocol
> compression extensions library
> ii  libxcompshad3:i386
> 2:3.5.0.33-0~201711080756~ubuntu14.04.1  i386 nx-X11
> shadowing library
> ii  nxagent
> 2:3.5.0.33-0~201711080756~ubuntu14.04.1  i386 NX agent
> ii  nx-x11-common
> 2:3.5.0.33-0~201711080756~ubuntu14.04.1  all  nx-X11 (common
> files)
> ii  qtcreator-plugin-qnx:i386
> 3.0.1+14.04.20140410.1-0ubuntu1  i386 QNX plugin for
> Qt Creator IDE
> ii  x2goagent
> 2:3.5.0.33-0~201711080756~ubuntu14.04.1  all  X2Go agent
> ii  x2goserver
> 4.0.1.21-0~201711081403~ubuntu14.04.1i386 X2Go server
> daemon scripts
> ii  x2goserver-extensions
> 4.0.1.21-0~201711081403~ubuntu14.04.1all  X2Go server
> daemon scripts (extensions)
> ii  x2goserver-xsession
> 4.0.1.21-0~201711081403~ubuntu14.04.1all  X2Go server
> daemon scripts (Xsession runner)
> rc  libx2go-server-db-perl
> 4.1.0.0-0~1517~ubuntu14.04.1 i386 Perl
> X2Go::Server:DB package
> rc  x2goclient
> 4.1.1.1-0~1719~ubuntu14.04.1 i386 X2Go Client
> application (Qt4)
> rc  x2goserver-common
> 4.1.0.0-0~1517~ubuntu14.04.1 i386 X2Go Server
> (common files)
> rc  x2goserver-fmbindings
> 4.1.0.0-0~1517~ubuntu14.04.1 all  X2Go Server
> (file manager bindings)
> rc  x2goserver-printing
> 4.1.0.0-0~1517~ubuntu14.04.1 all  X2Go server
> (printing support)
> rc  x2goserver-x2goagent
> 4.1.0.0-0~1517~ubuntu14.04.1 all  X2Go Server's
> X2Go Agent
>
> Unfortunately i can no longer connect. It connects then disconnects.
> This is the session log
>
> $ cat /tmp/.x2go-mario/C-mario-56-1520344207_stDKDE_dp24/session.log
>
> running as X2Go Agent
>
> NXAGENT - Version 3.5.0
>
> Copyright (C) 2001, 2011 NoMachine.
> See http://www.nomachine.com/
> 
> for more information.
>
> Info: Agent running with pid '6173'.
> Session: Starting session at 'Tue Mar  6 14:50:08 2018'.
> 

Re: [X2Go-User] nxagent

[Mario Theodoridis]

On 06/03/18 14:18, martti pitkanen wrote:


Hi,

Is there hands-on instructions how to downgrade to Saimaa in Ubuntu 
(4.13.0-)?

X2Go sessions terminate in random way.


Yes.

This is what i just did more or less following Stefans advice.


sudo mv x2go-stable-trusty.list x2go-stable-trusty.list.not
sudo add-apt-repository ppa:x2go/saimaa
sudo apt-get update

sudo apt-get remove libnx-x11-6:i386 nxagent nxproxy nx-x11-common 
x2goclient x2goserver* libx2go-log-perl libx2go-server-db-perl 
libx2go-server-perl libxcomp3:i386 libxcompshad3:i386

sudo apt-get install x2goserver x2goserver-xsession

This leaves me with

 dpkg -l | egrep "(x2go|nx)" | sort
ii  libjs-sphinxdoc 1.2.2+dfsg-1ubuntu1.1    
all  JavaScript support for Sphinx documentation
ii  libnx-x11-6:i386 2:3.5.0.33-0~201711080756~ubuntu14.04.1  
i386 nx-X11 client-side library
ii  libnx-xcomposite1:i386 2:3.5.0.33-0~201711080756~ubuntu14.04.1  
i386 nx-X11 Composite extension library
ii  libnx-xdamage1:i386 2:3.5.0.33-0~201711080756~ubuntu14.04.1  
i386 nx-X11 damaged region extension library
ii  libnx-xdmcp6:i386 2:3.5.0.33-0~201711080756~ubuntu14.04.1  
i386 nx-X11 Display Manager Control Protocol library
ii  libnx-xext6:i386 2:3.5.0.33-0~201711080756~ubuntu14.04.1  
i386 nx-X11 miscellaneous extension library
ii  libnx-xfixes3:i386 2:3.5.0.33-0~201711080756~ubuntu14.04.1  
i386 nx-X11 miscellaneous 'fixes' extension library
ii  libnx-xinerama1:i386 2:3.5.0.33-0~201711080756~ubuntu14.04.1  
i386 nx-X11 Xinerama extension library
ii  libnx-xpm4:i386 2:3.5.0.33-0~201711080756~ubuntu14.04.1  
i386 nx-X11 pixmap library
ii  libnx-xrandr2:i386 2:3.5.0.33-0~201711080756~ubuntu14.04.1  
i386 nx-X11 RandR extension library
ii  libnx-xrender1:i386 2:3.5.0.33-0~201711080756~ubuntu14.04.1  
i386 nx-X11 Rendering Extension client library
ii  libnx-xtst6:i386 2:3.5.0.33-0~201711080756~ubuntu14.04.1  
i386 nx-X11 Testing -- Record extension library
ii  libxcomp3:i386 2:3.5.0.33-0~201711080756~ubuntu14.04.1  
i386 nx-X11 compression library
ii  libxcompext3:i386 2:3.5.0.33-0~201711080756~ubuntu14.04.1  
i386 nx-X11 protocol compression extensions library
ii  libxcompshad3:i386 2:3.5.0.33-0~201711080756~ubuntu14.04.1  
i386 nx-X11 shadowing library
ii  nxagent 2:3.5.0.33-0~201711080756~ubuntu14.04.1  i386 NX 
agent
ii  nx-x11-common 2:3.5.0.33-0~201711080756~ubuntu14.04.1  
all  nx-X11 (common files)
ii  qtcreator-plugin-qnx:i386 
3.0.1+14.04.20140410.1-0ubuntu1  i386 QNX plugin for 
Qt Creator IDE
ii  x2goagent 2:3.5.0.33-0~201711080756~ubuntu14.04.1  all  
X2Go agent
ii  x2goserver 4.0.1.21-0~201711081403~ubuntu14.04.1    i386 
X2Go server daemon scripts
ii  x2goserver-extensions 4.0.1.21-0~201711081403~ubuntu14.04.1    
all  X2Go server daemon scripts (extensions)
ii  x2goserver-xsession 4.0.1.21-0~201711081403~ubuntu14.04.1    
all  X2Go server daemon scripts (Xsession runner)
rc  libx2go-server-db-perl 4.1.0.0-0~1517~ubuntu14.04.1 
i386 Perl X2Go::Server:DB package
rc  x2goclient 4.1.1.1-0~1719~ubuntu14.04.1 i386 
X2Go Client application (Qt4)
rc  x2goserver-common 4.1.0.0-0~1517~ubuntu14.04.1 
i386 X2Go Server (common files)
rc  x2goserver-fmbindings 4.1.0.0-0~1517~ubuntu14.04.1 
all  X2Go Server (file manager bindings)
rc  x2goserver-printing 4.1.0.0-0~1517~ubuntu14.04.1 
all  X2Go server (printing support)
rc  x2goserver-x2goagent 4.1.0.0-0~1517~ubuntu14.04.1 
all  X2Go Server's X2Go Agent


Unfortunately i can no longer connect. It connects then disconnects.
This is the session log

$ cat /tmp/.x2go-mario/C-mario-56-1520344207_stDKDE_dp24/session.log

running as X2Go Agent

NXAGENT - Version 3.5.0

Copyright (C) 2001, 2011 NoMachine.
See http://www.nomachine.com/ for more information.

Info: Agent running with pid '6173'.
Session: Starting session at 'Tue Mar  6 14:50:08 2018'.
Info: Proxy running in server mode with pid '6173'.
Info: Waiting for connection from 'localhost' on port '52991'.
Info: Accepted connection from '127.0.0.1'.
Info: Connection with remote proxy completed.
Info: Using WAN link parameters 1408/24/1/0.
Info: Using agent parameters 5000/5/50/0/0.
Info: Using cache parameters 4/4096KB/8192KB/8192KB.
Info: Using pack method '16m-jpeg-9' with session 'unix-kde-depth_24'.
Info: Using ZLIB data compression 1/1/32.
Info: Using ZLIB stream compression 1/1.
Info: No suitable cache file found.
Info: Listening to X11 connections on display ':56'.
Error: Aborting session with 'Unable to open display 
'nx/nx,options=/tmp/.x2go-mario/C-mario-56-1520344207_stDKDE_dp24/options:56''.

Session: Aborting session at 'Tue 

Re: [X2Go-User] nxagent

[Stefan Baur]

Am 06.03.2018 um 14:18 schrieb martti pitkanen:
> Is there hands-on instructions how to downgrade to Saimaa in Ubuntu
> (4.13.0-)?
> X2Go sessions terminate in random way.
> 

This is untested, but it should work something like this:

- Remove your current X2Go PPA
- use https://launchpad.net/~x2go/+archive/ubuntu/saimaa instead
- run apt-get update
- run the following set of commands:
  dpkg -l | awk '$1="ii" && ($2~/x2go/ || $2~/nx/) { print $2 }' | \
  xargs -n 1 apt-cache show | egrep 'Package|Version' | tr -d "\n" | \
  sed -e 's/Package: /\n/g' -e 's/Version: /=/g'

This should give you a list of all x2go/nx-related packages, along with
their version numbers, ready for copy-and-pasting to apt-get install.

Kind Regards,
Stefan Baur

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Re: [X2Go-User] nxagent

[martti pitkanen]

Hi,

Is there hands-on instructions how to downgrade to Saimaa in Ubuntu 
(4.13.0-)?

X2Go sessions terminate in random way.


On 03/06/2018 03:03 PM, Stefan Baur wrote:

Am 06.03.2018 um 13:54 schrieb Mario Theodoridis:

Is there a way to downgrade?

Several, actually.

You can switch to the saimaa repository, or to a timestamped repository
with a timestamp before the change.  I would suggest saimaa, as it means
you will not be cut off from security updates, unlike a timestamped repo.

You will probably have to force-downgrade the packages once you've
switched repos.

apt-get install =

is probably the command you should be using for that on Debian/Ubuntu.

Kind Regards,
Stefan Baur



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Re: [X2Go-User] nxagent

[Stefan Baur]

Am 06.03.2018 um 13:54 schrieb Mario Theodoridis:
> Is there a way to downgrade?

Several, actually.

You can switch to the saimaa repository, or to a timestamped repository
with a timestamp before the change.  I would suggest saimaa, as it means
you will not be cut off from security updates, unlike a timestamped repo.

You will probably have to force-downgrade the packages once you've
switched repos.

apt-get install =

is probably the command you should be using for that on Debian/Ubuntu.

Kind Regards,
Stefan Baur

-- 
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Geschäftsführer: Stefan Baur
Eichenäckerweg 10, 89081 Ulm | Registergericht Ulm, HRB 724364
Fon/Fax 0731 40 34 66-36/-35 | USt-IdNr.: DE268653243



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Re: [X2Go-User] nxagent

[Mario Theodoridis]

On 05/03/18 16:48, Mario Theodoridis wrote:

On 05/03/18 13:41, Mario Theodoridis wrote:

On 04/03/18 09:44, Mihai Moldovan wrote:

* On 03/04/2018 01:54 AM, Robert Dinse wrote:

   Yes consuming a large amount of CPU and not doing anything useful,
customer is disconnected.  Connection is still possible but doesn't get rid
of the stuck processes, I have to kill -9 to get rid of them.

Uhm... "stuck" is pretty ambiguous in that context - I assume that you are
referring to the CPU usage, which doesn't go down to sane levels even after
reconnecting, but reconnecting to the session as such is possible?

Is there any reasonable way to trigger this behavior? Like starting a MATE
session, disconnecting and waiting for an hour to see the CPU usage spike? Or is
it triggered by other programs running inside of the session?

I'll need something to reproduce it, server OS information would also be great.

Oh, maybe some details
Server:

[mario@lindev 13:30:31 ~]$ dpkg -l | egrep "(x2go|nx)"
ii  libjs-sphinxdoc 1.2.2+dfsg-1ubuntu1.1    all 
JavaScript support for Sphinx documentation
ii  libnx-x11-6:i386 2:3.5.99.14-0~816~ubuntu14.04.1  
i386 nxagent's libNX_X11 client-part library
rc  libnx-xcomposite1:i386 
2:3.5.0.33-0~710~ubuntu14.04.1   i386 nx-X11 
Composite extension library
rc  libnx-xdamage1:i386 2:3.5.0.33-0~710~ubuntu14.04.1   
i386 nx-X11 damaged region extension library
rc  libnx-xdmcp6:i386 2:3.5.0.33-0~710~ubuntu14.04.1   
i386 nx-X11 Display Manager Control Protocol library
rc  libnx-xext6:i386 2:3.5.0.33-0~710~ubuntu14.04.1   
i386 nx-X11 miscellaneous extension library
rc  libnx-xfixes3:i386 2:3.5.0.33-0~710~ubuntu14.04.1   
i386 nx-X11 miscellaneous 'fixes' extension library
rc  libnx-xinerama1:i386 2:3.5.0.33-0~710~ubuntu14.04.1   
i386 nx-X11 Xinerama extension library
rc  libnx-xpm4:i386 2:3.5.0.33-0~710~ubuntu14.04.1   
i386 nx-X11 pixmap library
rc  libnx-xrandr2:i386 2:3.5.0.33-0~710~ubuntu14.04.1   
i386 nx-X11 RandR extension library
rc  libnx-xrender1:i386 2:3.5.0.33-0~710~ubuntu14.04.1   
i386 nx-X11 Rendering Extension client library
rc  libnx-xtst6:i386 2:3.5.0.33-0~710~ubuntu14.04.1   
i386 nx-X11 Testing -- Record extension library
ii  libx2go-log-perl 4.1.0.0-0~1517~ubuntu14.04.1 
all  Perl X2Go::Log package
ii  libx2go-server-db-perl 
4.1.0.0-0~1517~ubuntu14.04.1 i386 Perl 
X2Go::Server:DB package
ii  libx2go-server-perl 4.1.0.0-0~1517~ubuntu14.04.1 
all  Perl X2Go::Server package
rc  libxcompext3:i386 2:3.5.0.33-0~710~ubuntu14.04.1   
i386 nx-X11 protocol compression extensions library
ii  nx-x11-common 2:3.5.99.14-0~816~ubuntu14.04.1  
all  nx-X11 (common files)
ii  nxagent 2:3.5.99.14-0~816~ubuntu14.04.1  i386 
Nested Xserver (aka NX Agent) supporting the NX compression protocol
ii  nxproxy 2:3.5.99.14-0~816~ubuntu14.04.1  i386 
NX proxy
ii  qtcreator-plugin-qnx:i386 
3.0.1+14.04.20140410.1-0ubuntu1  i386 QNX plugin 
for Qt Creator IDE
rc  x2goagent 2:3.5.0.33-0~710~ubuntu14.04.1   
all  X2Go agent
ii  x2goclient 4.1.1.1-0~1719~ubuntu14.04.1 
i386 X2Go Client application (Qt4)
ii  x2goserver 4.1.0.0-0~1517~ubuntu14.04.1 
i386 X2Go server daemon scripts
ii  x2goserver-common 4.1.0.0-0~1517~ubuntu14.04.1 
i386 X2Go Server (common files)
ii  x2goserver-extensions 
4.1.0.0-0~1517~ubuntu14.04.1 all  X2Go Server 
(extension support)
ii  x2goserver-fmbindings 
4.1.0.0-0~1517~ubuntu14.04.1 all  X2Go Server 
(file manager bindings)
ii  x2goserver-printing 4.1.0.0-0~1517~ubuntu14.04.1 
all  X2Go server (printing support)
ii  x2goserver-x2goagent 4.1.0.0-0~1517~ubuntu14.04.1 
all  X2Go Server's X2Go Agent
ii  x2goserver-xsession 4.1.0.0-0~1517~ubuntu14.04.1 
all  X2Go Server (Xsession runner)

[mario@lindev 13:38:15 ~]$ uname -a
Linux lindev.de.regify.com 3.13.0-142-generic #191-Ubuntu SMP Fri Feb 
2 12:14:37 UTC 2018 i686 i686 i686 GNU/Linux

[mario@lindev 13:38:32 ~]$ cat /etc/issue
Ubuntu 14.04.5 LTS \n \l

Client:
[mario@fatty 13:40:25 ~]$ dpkg -l | egrep "(x2go|nx)"
ii  libjs-sphinxdoc 1.2.2+dfsg-1ubuntu1.1 all  JavaScript 
support for Sphinx documentation
ii  libxcomp3:amd64 2:3.5.0.33-0~710~ubuntu14.04.1 amd64    
nx-X11 compression library

ii  nxproxy 2:3.5.0.33-0~710~ubuntu14.04.1 amd64    NX proxy
ii  x2goclient 4.1.1.0-0~1679~ubuntu14.04.1 amd64    X2Go Client 
application (Qt4)

[mario@fatty 13:40:38 ~]$ uname -a
Linux fatty 3.13.0-137-generic 

[X2Go-User] X2Go Client: Startup of VcXsrv sometimes fails

[Schmid Andreas]

Hi,

I'm running X2Go Client 4.1.0.0 on Windows Server 2012 R2 for connecting to 
X2Go Server 4.0.1.22 on Ubuntu 14.04. This usually works flawlessly. Since 
about 4 months ago, however, X2Go Client *sometimes* fails to fully establish 
the session. (Sometimes means that it happens quite unregularly; which makes it 
hard to reproduce. But when it happens, it can last from 5 minutes up to around 
30 minutes until connections are successful again.) In these cases X2Go Client 
actually connects to the server, but the startup of VcXsrv fails, so X2Go 
Client subsequently terminates the connection. I attached the log output of 
VcXsrv below.
I suspect that in the cases when the connection fails to fully establish, 
VcXsrv for some reason doesn't manage to find a free display number.
Maybe this is due to the fact that on the Windows server several users are 
logged in simultaneously and use X2Go Client. Another guess is that VcXsrv 
might not like the fact that the Windows server has two IPv4 addresses.
Does anyone have a clue what could be the reason for it? Or where I could find 
further information on these error messages? Thank you for any hint.


On the client side, the following is logged in 
C:\Users\\AppData\Local\Temp\VCXSrv.0.log when the connection fails:

--
Welcome to the VcXsrv X Server
Vendor: The X2Go and Arctica Projects
Release: 1.17.0.0

OS: Windows NT 6.2 build 9200 (WoW64)
Contact: https://github.com/ArcticaProject/vcxsrv

_XSERVTransSocketCreateListener: failed to bind listener
_XSERVTransSocketINETCreateListener: ...SocketCreateListener() failed
_XSERVTransMakeAllCOTSServerListeners: failed to create listener for inet
DefineSelf - d16s003 has IPv6 addresses...
 ::1
LoadPreferences: C:\Users\\AppData\Roaming/.XWinrc not found
LoadPreferences: Loading P:\X2Go\V4_1_0_0\x2goclient\vcxsrv\system.XWinrc
Warning: Locale not supported by X, falling back to 'C' locale.
wglwrap: Can't resolve "wglGetExtensionsStringARB"
(EE) AIGLX: Won't use generic native renderer as it is not accelerated
(II) AIGLX: Loaded and initialized swrast
(II) GLX: Initialized DRISWRAST GL provider for screen 0
winBlockHandler - pthread_mutex_unlock()
winInitMultiWindowWM - Could not open display, try: 1, sleeping: 5
winInitMultiWindowWM - Could not open display, try: 2, sleeping: 5
winInitMultiWindowWM - Could not open display, try: 3, sleeping: 5
winInitMultiWindowWM - Could not open display, try: 4, sleeping: 5
winInitMultiWindowWM - Could not open display, try: 5, sleeping: 5
winInitMultiWindowWM - Failed opening the display.  Exiting.
(EE) Server terminated with error (1). Closing log file.
--


In the case of successful connection, the log output looks like:

--
Welcome to the VcXsrv X Server
Vendor: The X2Go and Arctica Projects
Release: 1.17.0.0

OS: Windows NT 6.2 build 9200 (WoW64)
Contact: https://github.com/ArcticaProject/vcxsrv

DefineSelf - d16s003 has 2 usable IPv4 interfaces...
 addresses 10.36.2.103 10.36.18.106
DefineSelf - d16s003 has IPv6 addresses...
 ::1
LoadPreferences: C:\Users\\AppData\Roaming/.XWinrc not found
LoadPreferences: Loading P:\X2Go\V4_1_0_0\x2goclient\vcxsrv\system.XWinrc
Warning: Locale not supported by X, falling back to 'C' locale.
wglwrap: Can't resolve "wglGetExtensionsStringARB"
(EE) AIGLX: Won't use generic native renderer as it is not accelerated
(II) AIGLX: Loaded and initialized swrast
(II) GLX: Initialized DRISWRAST GL provider for screen 0
winBlockHandler - pthread_mutex_unlock()
winClipboardThreadProc - DISPLAY=127.0.0.1:0.0
--


When I just start vcxsrv.exe, I'm getting the same messages. At times when 
connections fail:

--
Welcome to the VcXsrv X Server
Vendor: The X2Go and Arctica Projects
Release: 1.17.0.0

OS: Windows NT 6.2 build 9200 (WoW64)
Contact: https://github.com/ArcticaProject/vcxsrv

_XSERVTransSocketCreateListener: failed to bind listener
_XSERVTransSocketINETCreateListener: ...SocketCreateListener() failed
_XSERVTransMakeAllCOTSServerListeners: failed to create listener for inet
DefineSelf - d16s003 has IPv6 addresses...
 ::1
LoadPreferences: C:\Users\\AppData\Roaming/.XWinrc not found
LoadPreferences: Loading P:\X2Go\V4_1_0_0\x2goclient\VcXsrv\system.XWinrc
Warning: Locale not supported by X, falling back to 'C' locale.
(EE) AIGLX: No native OpenGL in modes with a root window
(II) AIGLX: Loaded and initialized swrast
(II) GLX: Initialized DRISWRAST GL provider for screen 0
winBlockHandler - pthread_mutex_unlock()
--


At times when connections work:

--
Welcome to the VcXsrv X Server
Vendor: The X2Go and Arctica Projects
Release: 1.17.0.0

OS: Windows NT 6.2 build 9200 (WoW64)
Contact: https://github.com/ArcticaProject/vcxsrv

DefineSelf - d16s003 has 2 usable IPv4 interfaces...
 addresses 10.36.2.103 10.36.18.106
DefineSelf - d16s003 has IPv6 addresses...
 ::1
LoadPreferences: C:\Users\\AppData\Roaming/.XWinrc not found
LoadPreferences: Loading P:\X2Go\V4_1_0_0\x2goclient\VcXsrv\system.XWinrc
Warning: Locale not supported by X, falling back to 'C'