VNC connection lost when initiating telnet session quits
Dr Robert Young
rcyoung "at" aliconsultants.com
Fri Apr 29 19:27:01 2005
Tried the following after telnet into server system & doing
su -root
# $SHELL
# /usr/local/bin/vncserver
New 'ultra10:1 ()' desktop is ultra10:1
Starting applications specified in //.vnc/xstartup
Log file is //.vnc/ultra10:1.log
# ps -a
PID TTY TIME CMD
1141 pts/1 0:00 vncconfi
1120 pts/1 0:00 sh
1052 0:00 <defunct>
1126 pts/1 0:00 sh
1142 pts/1 0:00 xterm
1145 pts/1 0:00 twm
1135 pts/1 0:00 Xvnc
1149 pts/1 0:00 ps
1011 0:00 <defunct>
#exit
Everything is still running at this point, and I am still in as root
# ps -a
PID TTY TIME CMD
1141 pts/1 0:00 vncconfi
1120 pts/1 0:00 sh
1052 0:00 <defunct>
1150 pts/1 0:00 ps
1142 pts/1 0:00 xterm
1145 pts/1 0:00 twm
1135 pts/1 0:00 Xvnc
1011 0:00 <defunct>
# exit
$
Back as original telnet 'login' user
$ ps -A
PID TTY TIME CMD
0 ? 0:00 sched
1 ? 0:00 init
2 ? 0:00 pageout
3 ? 2:50 fsflush
266 ? 0:00 sac
228 ? 0:00 utmpd
119 ? 0:00 in.route
125 ? 0:00 rpcbind
127 ? 0:00 keyserv
163 ? 0:00 lockd
164 ? 0:00 inetd
165 ? 0:00 statd
171 ? 0:00 automoun
207 ? 0:00 lpsched
180 ? 0:00 syslogd
202 ? 0:00 nscd
1141 pts/1 0:00 vncconfi
220 ? 0:00 powerd
186 ? 0:00 cron
268 console 0:00 ttymon
235 ? 0:00 vold
282 ? 0:00 mibiisa
272 ? 0:00 ttymon
281 ? 0:01 Xsun
285 ? 0:00 fbconsol
253 ? 0:00 snmpdx
1092 ? 0:00 in.telne
260 ? 0:00 dmispd
262 ? 0:00 snmpXdmi
297 ? 0:00 dtgreet
283 ? 0:00 dtlogin
271 ? 0:00 dtlogin
1151 pts/1 0:00 ps
298 ? 0:00 sendmail
1052 0:00 <defunct>
330 ? 0:00 rpc.ttdb
1142 pts/1 0:00 xterm
1045 ? 0:01 dtwm
1010 ? 0:00 ttsessio
1145 pts/1 0:00 twm
1143 pts/2 0:00 sh
1051 ? 0:00 ttsessio
1135 pts/1 0:00 Xvnc
1011 0:00 <defunct>
1094 pts/1 0:00 sh
1004 ? 0:01 dtwm
Server is up and running with no problems. VNC client attaches and you
see vncconfig and an xterm (std config).
Exit out of initial telnet session entirely, and while grey desktop &
'X' cursor remains, xterm and any other apps 'disapper'.
Logging back in w/ telent you see the following
Last login: Fri Apr 29 14:00:34 from 208.246.88.151
Sun Microsystems Inc. SunOS 5.7 Generic October 1998
$ ps -A
PID TTY TIME CMD
0 ? 0:00 sched
1 ? 0:00 init
2 ? 0:00 pageout
3 ? 2:50 fsflush
266 ? 0:00 sac
228 ? 0:00 utmpd
119 ? 0:00 in.route
125 ? 0:00 rpcbind
127 ? 0:00 keyserv
163 ? 0:00 lockd
164 ? 0:00 inetd
165 ? 0:00 statd
171 ? 0:00 automoun
207 ? 0:00 lpsched
180 ? 0:00 syslogd
202 ? 0:00 nscd
220 ? 0:00 powerd
186 ? 0:00 cron
268 console 0:00 ttymon
235 ? 0:00 vold
282 ? 0:00 mibiisa
272 ? 0:00 ttymon
281 ? 0:01 Xsun
285 ? 0:00 fbconsol
253 ? 0:00 snmpdx
1154 pts/1 0:00 sh
260 ? 0:00 dmispd
262 ? 0:00 snmpXdmi
297 ? 0:00 dtgreet
283 ? 0:00 dtlogin
271 ? 0:00 dtlogin
298 ? 0:00 sendmail
1052 0:00 <defunct>
330 ? 0:00 rpc.ttdb
1045 ? 0:01 dtwm
1010 ? 0:00 ttsessio
1152 ? 0:00 in.telne
1051 ? 0:00 ttsessio
1135 ? 0:01 Xvnc
1011 0:00 <defunct>
1160 pts/1 0:00 ps
1004 ? 0:01 dtwm
$
As suspected, the Xvnc server is there, but vxcconfig and the xterm
which had both been started in the Xvnc server session are missing.
The question is why?
I do not need ssh for this system as it is already behind a full
firewall, and my "viewing" of it is also contained completely behind
the firewall ( mostly, it is for testing and sits in a back room
unattended). I am mimicing a setup at a remote site, and when viewing
the remote location ( for real 'work') I will be going through a VPN.
On Apr 29, 2005, at 1:09 PM, Sean Kamath wrote:
>
> I have a vague recollection of process leader problems with telnet (I
> too use SSH, as it is the only reasonable way to go these days. ;-)).
>
> Try this:
>
> <prompt> $SHELL
> <prompt> vncserver
> <prompt> exit
> <prompt> ps -ef | grep Xvnc
> <prompt> ptree <Xvnc-pid>
>
> Make sure that Xvnc has all the appropriate processes running. ;-)
>
> Sean
>
> [In a message on Fri, 29 Apr 2005 08:54:54 EDT,
> John Aldrich wrote:]
>> That's strange... On my linux box, I can log out of all SSH sessions
>> (I
>> don't "do" telnet for security reasons!) and my server stays up and
>> running.
>> It almost sounds like the X session is checking to make sure the user
>> who
>> started the session is still logged in and is using their defaults,
>> but when
>> the user logs out, it doesn't know what window manager to use.
>> John
>>
>> -----Original Message-----
>> From: Dr Robert Young [mailto:rcyoung "at" aliconsultants.com]
>> Sent: Friday, April 29, 2005 8:24 AM
>> To: vnc-list "at" realvnc.com
>> Subject: VNC connection lost when initiating telnet session quits
>>
>>
>> Let's say I start the vncserver from an initial telnet session.
>>
>> Using the VNC server for Solaris 7, the same session "stays" open
>> when
>> I start/stop the VNC client. So far it behaves as expected.
>>
>> However, if I exit the telnet session which started the server, all
>> the desktop apps "disappear" and I have a grey backdrop. If I then
>> "kill" the server, the client says the server connection has been
>> terminated.
>>
>> I have tried "nohup vncserver &" with the same results, and started
>> the
>> window manager /xterm in xstartup using nohup ---& as well with the
>> same results. .
>>
>> Any ideas? I have a nagging feeling I have seen something like this
>> before 10-15 yrs ago, but memory fails.
>> _______________________________________________
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>>
>
> Sean