Re: [X2Go-User] No terminal windows, no logout.

[Ulrich Sibiller]

On Mon, Sep 30, 2019 at 1:19 PM Thomas Stephan
 wrote:
>
> Hi,
>
> we use x2go for multiple users to connect to workstations running Ubuntu
> 16.04.6 LTS. Clients run on MacOSX or Windows machines.
> After using the setup for some days with multiple reconnects, for
> unknown reasons we can no longer open terminal applications via these
> remote-desktops.
> This applies to all terminal applications like UXTerm, Xfce Terminal,
> XTerm, etc.
> We can still perfectly open a file manager, or e.g. Matlab and work with
> those.
> We can also no longer close the session because the confirmation dialog
> to confirm user logout does not appear.
> It seems like there is a terminal process started every time we start a
> terminal via the desktop GUI. But the window does not show up.
> After rebooting the workstation, everything works fine again, terminals
> can be opened, logout confirmation dialog pops up.

This looks to me how a shell accessing a stale mount. When then
problem shows up next time (temporarily) mv your .bashrc out of the
way and try to open an terminal.

Uli

BTW: are the home dirs local on the server or mounted via NFS?
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[X2Go-User] X2Go on a Plane!

[Stefan Baur]

Hi List,

Our "X2Go: The Gathering 2019" participant Martti Pitkanen tried
something out that I sadly couldn't try on my last flight with Finnair,
due to some technical difficulties with the satellite uplink:

Starting an X2Go Desktop Session with a server on the ground while in
mid-flight!

And he even managed to record a video of it!

Watch this: 

The really impressive feat is that Martti is using the "browsing"
internet package Finnair offers - which is marketed as "only good for
Web browsing and E-Mail", rather than the more expensive "streaming"
package.

Finnair says they block streaming and VPN access on the "browsing"
package, but - SSH works, and thus X2Go works as well.  As you can see
in Martti's video, the speed with which the screen gets updated is
totally okay, too (especially considering that he is using Chrome
Browser in the remote session, which isn't exactly fast over X2Go, even
on a wired connection).

This is a big advantage for Linux and X2Go compared to an RDP connection
to a Windows machine - we don't need a separate VPN connection to make
things safe (we can simply use 2FA via PAM, or an SSH keyfile +
passphrase), so we're - allow me the pun - flying under Finnair's radar
for VPN connections, and the small internet package is sufficient for X2Go.

By the way, should Finnair choose to block SSH in the future, there are
probably some ways around that as well.

The easiest one is to switch the SSH port from 22 to 443 - if they're
only blacklisting/whitelisting ports. 443 is https, and cheap
firewall/proxy settings usually allow direct connections to that port
without further inspection or MitM-proxying.

The more complicated one would be running a web proxy on your remote
machine that listens to outside connections on Port 443, but only allows
CONNECT type requests to localhost on port 22 (and blocks everything
else).  Then you'd set up X2GoClient to use that web proxy in the
session configuration.  That way, the traffic should look like
http/https traffic to any packet-inspecting firewall.

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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[X2Go-User] No terminal windows, no logout.

[Thomas Stephan]

Hi,

we use x2go for multiple users to connect to workstations running Ubuntu
16.04.6 LTS. Clients run on MacOSX or Windows machines.
After using the setup for some days with multiple reconnects, for
unknown reasons we can no longer open terminal applications via these
remote-desktops.
This applies to all terminal applications like UXTerm, Xfce Terminal,
XTerm, etc.
We can still perfectly open a file manager, or e.g. Matlab and work with
those.
We can also no longer close the session because the confirmation dialog
to confirm user logout does not appear.
It seems like there is a terminal process started every time we start a
terminal via the desktop GUI. But the window does not show up.
After rebooting the workstation, everything works fine again, terminals
can be opened, logout confirmation dialog pops up.

Currently we use XFCE desktop.

Best regards,
Thomas
 

-- 
Dr. Thomas Stephan
Arbeitsgruppe für funktionelle, strukturelle und molekulare Bildgebung
Neurologische Forschung
Klinikum Grosshadern 
Fraunhoferstr. 20
82152 Planegg/Martinsried

thomas.step...@lrz.uni-muenchen.de
+49 89  4400-74819 (Fon)
+49 89  4400-74801 (Fax)

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