Can't talk to X server through ssh tunnel after ~ 18 minutes

Can't talk to X server through ssh tunnel after ~ 18 minutes

[Andrew DeFaria]

I ssh from my Cygwin box to a Linux machine (happens with Solaris 
machines too) and I can run X applications back to Cygwin/X without a 
problem. However, after a few minutes something happens to the tunnel 
and I can no longer put up any X windows:

$ cat checks.sh
#!/bin/bash
while true; do
   date
   xclock &
   sleep 2
   killall xclock
   if [ $? != 0 ]; then
     echo Cannot talk to X Server anymore
   else
     sleep 60
   fi
done
$ checkx.sh
Tue May 24 09:48:43 PDT 2011
./checkx.sh: line 12: 10927 Terminated              xclock
Tue May 24 09:49:45 PDT 2011
./checkx.sh: line 12: 11393 Terminated              xclock
Tue May 24 09:50:47 PDT 2011
b./checkx.sh: line 12: 11592 Terminated              xclock
Tue May 24 09:51:49 PDT 2011
./checkx.sh: line 12: 11782 Terminated              xclock
Tue May 24 09:52:51 PDT 2011
./checkx.sh: line 12: 11977 Terminated              xclock
Tue May 24 09:53:53 PDT 2011
./checkx.sh: line 12: 12161 Terminated              xclock
Tue May 24 09:54:55 PDT 2011
./checkx.sh: line 12: 12345 Terminated              xclock
Tue May 24 09:55:57 PDT 2011
./checkx.sh: line 12: 12534 Terminated              xclock
Tue May 24 09:56:59 PDT 2011
./checkx.sh: line 12: 12723 Terminated              xclock
Tue May 24 09:58:01 PDT 2011
./checkx.sh: line 12: 12912 Terminated              xclock
Tue May 24 09:59:03 PDT 2011
./checkx.sh: line 12: 13142 Terminated              xclock
Tue May 24 10:00:05 PDT 2011
./checkx.sh: line 12: 13345 Terminated              xclock
Tue May 24 10:01:07 PDT 2011
./checkx.sh: line 12: 13578 Terminated              xclock
Tue May 24 10:02:09 PDT 2011
./checkx.sh: line 12: 13843 Terminated              xclock
Tue May 24 10:03:11 PDT 2011
./checkx.sh: line 12: 14074 Terminated              xclock
Tue May 24 10:04:13 PDT 2011
./checkx.sh: line 12: 14260 Terminated              xclock
Tue May 24 10:05:16 PDT 2011
./checkx.sh: line 12: 14455 Terminated              xclock
Tue May 24 10:06:18 PDT 2011
X connection to localhost:15.0 broken (explicit kill or server shutdown).
xclock: no process killed
Cannot talk to X Server anymore

After this I cannot re-establish an X connection until I exit the ssh 
session and ssh back in again. Any ideas?

(I'm gonna post this to both Cygwin and Cygwin-X as I'm not sure if this 
is a problem with ssh or a problem with X).
-- 
<a href="http://defaria.com">Andrew DeFaria</a><br>
<small><font color="#999999">If a man says something in the woods and 
there are no women there, is he still wrong?</font></small>



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Re: Can't talk to X server through ssh tunnel after ~ 18 minutes

[Jim Burwell]

[-- Attachment #1: Type: text/plain, Size: 3440 bytes --]

I have a similar issue on Windows 7 64 bit.  I don't even use SSH.  I
can just run an Xterm or other X app with display pointed directly to
the IP (after doing proper xhost, etc), and the window will display
(often I'll get crashes and stack traces a few times, then it will
display).  But then the windows will just vanish for no real reason. 
The X application will still be running on the remote box, but the
window is no where to be found on the display.

I typically kill off the xterm on the remote box and run it again.  It's
like the X server under windows is simply unmapping the window and it
goes into never-never land.  It happens fairly randomly to random
clients running on the same or different hosts.  One or two x-app
windows will vanish from that host, while others are still running fine.

Never happened to me under XP 32 bit.

- Jim


On 5/25/2011 10:43, Andrew DeFaria wrote:
> I ssh from my Cygwin box to a Linux machine (happens with Solaris
> machines too) and I can run X applications back to Cygwin/X without a
> problem. However, after a few minutes something happens to the tunnel
> and I can no longer put up any X windows:
>
> $ cat checks.sh
> #!/bin/bash
> while true; do
>   date
>   xclock &
>   sleep 2
>   killall xclock
>   if [ $? != 0 ]; then
>     echo Cannot talk to X Server anymore
>   else
>     sleep 60
>   fi
> done
> $ checkx.sh
> Tue May 24 09:48:43 PDT 2011
> ./checkx.sh: line 12: 10927 Terminated              xclock
> Tue May 24 09:49:45 PDT 2011
> ./checkx.sh: line 12: 11393 Terminated              xclock
> Tue May 24 09:50:47 PDT 2011
> b./checkx.sh: line 12: 11592 Terminated              xclock
> Tue May 24 09:51:49 PDT 2011
> ./checkx.sh: line 12: 11782 Terminated              xclock
> Tue May 24 09:52:51 PDT 2011
> ./checkx.sh: line 12: 11977 Terminated              xclock
> Tue May 24 09:53:53 PDT 2011
> ./checkx.sh: line 12: 12161 Terminated              xclock
> Tue May 24 09:54:55 PDT 2011
> ./checkx.sh: line 12: 12345 Terminated              xclock
> Tue May 24 09:55:57 PDT 2011
> ./checkx.sh: line 12: 12534 Terminated              xclock
> Tue May 24 09:56:59 PDT 2011
> ./checkx.sh: line 12: 12723 Terminated              xclock
> Tue May 24 09:58:01 PDT 2011
> ./checkx.sh: line 12: 12912 Terminated              xclock
> Tue May 24 09:59:03 PDT 2011
> ./checkx.sh: line 12: 13142 Terminated              xclock
> Tue May 24 10:00:05 PDT 2011
> ./checkx.sh: line 12: 13345 Terminated              xclock
> Tue May 24 10:01:07 PDT 2011
> ./checkx.sh: line 12: 13578 Terminated              xclock
> Tue May 24 10:02:09 PDT 2011
> ./checkx.sh: line 12: 13843 Terminated              xclock
> Tue May 24 10:03:11 PDT 2011
> ./checkx.sh: line 12: 14074 Terminated              xclock
> Tue May 24 10:04:13 PDT 2011
> ./checkx.sh: line 12: 14260 Terminated              xclock
> Tue May 24 10:05:16 PDT 2011
> ./checkx.sh: line 12: 14455 Terminated              xclock
> Tue May 24 10:06:18 PDT 2011
> X connection to localhost:15.0 broken (explicit kill or server shutdown).
> xclock: no process killed
> Cannot talk to X Server anymore
>
> After this I cannot re-establish an X connection until I exit the ssh
> session and ssh back in again. Any ideas?
>
> (I'm gonna post this to both Cygwin and Cygwin-X as I'm not sure if
> this is a problem with ssh or a problem with X).



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