[X2Go-User] session resuming after disconnect/reconnect

[Mike Gabriel]

Hi Gerald,

On Mi 24 Okt 2012 07:03:36 CEST  wrote:

> when a session gets disconnected (e.g. network connection is lost,  
> computer is powered down, without disconnect) I cannot simply resume  
> the session after the next connect.

Yes, this is a known issue with SSH and port forwarding. As X2Go media  
is transported over SSH port forwarding connections all parts of a  
session (graphics, audio, sshfs) are affected by disrupted connections  
that do not properly close open SSH port forwarding requests.

> I have first to pause the session, that wait a long time (don't know  
> exactly how long, but needs to be more than 30-60 seconds) and than  
> I am able to resume the session.

Yes, this exactly describes the phenomen. I have tried to catch these  
situations in Python X2Go code, but these precautions only work on  
some occasions.

> If I simply pause/resume the session or try to take it over, the  
> operation fails and the session is closed.
>
> Looks like after the pause of the old session, something does not  
> get terminated correctly and needs to timeout before I can resume  
> the session.
>
> Simply pausing/resuming a session works without problems, as long as  
> the ssh session isn't closed in between. It also works if I pause  
> the session, than disconnect the ssh connection. Than I can resume  
> after I have reconnected to the server.

What also works is restarting the SSH daemon on the server side.

Unfortunately, I cannot give more of a solution to this. If you find  
any ways to tweak the ssh daemon then we could put that into a README  
for Python X2Go (or into the wiki of X2Go).

Thanks,
Mike

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