[X2Go-User] Can't access X2go through router

[Paul Borowicz]

Bill, could this be your problem?

https://wiki.x2go.org/doku.php/doc:faq:start

Known Issues

Can't login to x2goserver with an ECDSA key

Currently, older versions of the ssh library used by X2Go called libssh are
unable to work with ECDSA keys. However you may use an RSA key - if you
need to - or go with the SSH default authenticating method using the remote
user's password.

SSH Login issue

If you already use OpenSSH to get a shell on your x2go server, you may get
this message when trying to connect with x2go:

The host key for
this server was not found but an othertype of key exists. An attacker
might change the default server key to confuse your client into thinking
the key does not exist
This is related to the ECDSA host key (related to the previous FAQ entry -
although there is a subtle difference between host and client keys.) To
solve this issue, you can disable ECDSA keys on your OpenSSH server
configuration, by commenting the following line in /etc/ssh/sshd_config
file:

#HostKey /etc/ssh/ssh_host_ecdsa_key
Then restart the SSH service. Now you should not get the error message
anymore.
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[X2Go-User] problems connecting to x2go server

[Paul Borowicz]

I run a personal server with x2go and I've used it for years with no
problem. I can currently ssh fine, but x2go does not work.
I've tried removing .x2go from /tmp and /home/paul. I've recreated the user
database:
rm -f /var/lib/x2go/x2go_sessions
x2godbadmin --createdb

None of this has worked. Removing and reinstalling seem to work, but it's
now back to the same error.

I have turned up logging and everything seems to complete properly. When I
run the client with a --debug flag I get this, with the final 2 lines
repeating:
Info: Proxy running in client mode with pid '22689'.
Session: Starting session at 'Mon Nov 20 14:35:24 2017'.
Info: Using abstract X11 socket in kernel namespace for accessing
DISPLAY=:1.
Info: Connecting to remote host 'localhost:37964'.
"
x2go-DEBUG-../src/onmainwindow.cpp:10759> "Searching proxy window:
X2GO-paul-50-1511206522_
stDXFCE_dp24"
x2go-DEBUG-../src/onmainwindow.cpp:12465> "Searching window with title:
X2GO-paul-50-151120
6522_stDXFCE_dp24"

Any insight would be appreciated.

Best Regards,

Paul Borowicz
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Re: [X2Go-User] ssh-keygen.exe loads the processor every time the client starts

[Orion Poplawski]

On 10/06/2017 12:57 AM, Ulrich Sibiller wrote:

On Fri, Oct 6, 2017 at 3:12 AM, Mihai Moldovan  wrote:


On 09/28/2017 01:49 PM, Max A. wrote:

I'm using a x2go server on CentOS 6.9 (the latest version from EPEL,
4.0.1.20), clients use Windows XP/7 and the latest version of X2Go
Client (4.1.0.0-2017.03.11). Each time the client connects,
ssh-keygen.exe (C:\Program Files\x2goclient\ssh-keygen.exe) starts with
the parameters "-t rsa -b 4096 -N" "-C" X2Go Client RSA user key "-f C:



I explicitly decided against that. For more information and the rationale for
this change, refer to the release announcement:
http://lists.x2go.org/pipermail/x2go-announcements/2017/000302.html


The release announcement talks about 2048-bit keys being generated
while this indicates that even stronger keys are being used (which in
turn increases the time to create them). I think for slow clients this
is too much. At least the admin should be able to decide about the
required security, not the maintainer.

So what about staying as is by default but providing a possibility to
pre-generate keys for those connections.

Uli


What about ed25519 keys?

 https://stribika.github.io/2015/01/04/secure-secure-shell.html

About 30-60 times faster to create on my fairly fast machine.

Unfortunately EL6 era machines don't support them.

--
Orion Poplawski
Manager of NWRA Technical Systems  720-772-5637
NWRA, Boulder/CoRA Office FAX: 303-415-9702
3380 Mitchell Lane   or...@nwra.com
Boulder, CO 80301 https://www.nwra.com/
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[X2Go-User] rstudio menus not displayed && qtcreator crash

[Piotr Balwierz]

Hello,
I have two problems with two IDEs.
1) For R programming I use Rstudio.I am starting mate-terminal via x2go, and then execute rstudio remotely. It displays well, apart from the fact that pull-down 
menus are not displayed. They got highlightedwhen clicked, but nothing more. This is the only program which has this issue that I am aware of.

Warning messages are as follows:
QXcbConnection: Failed to get the primary output of the screen
Could not initialize OpenGL for RasterGLSurface, reverting to RasterSurface.


2) For C++ I use qtcreator. It crashes immediatelywhen run via x2go:
$ qtcreator
failed to get the current screen resources
Could not initialize GLX
Aborted


3) Moreover mate-terminal window is not resizeable

Versions:
server: Latest Heuler 64bitfor Debian buster
client: x2goclient 4.1.1.0 64bit for Arch Linux, running plasma desktop

Thanks,
Piotr

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[X2Go-User] JSON API

[Kadyrbek Narmamatov]

Is there any JSON API for x2go client, so that I can use it in any language
?
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