topic Re: xdmcp problem in Operating System - HP-UX

xdmcp problem

Michael Koops_1 — Fri, 25 Feb 2005 06:58:45 GMT

Hello

since 2 days we have problems to establish CDE sessions on a zx6000 (11.23) with ReflectionX. The same problems appear with a suse-9.1-box while there are no problems with 2 old hp-ux-boxes (10.20). the Xerrors file in /var/dt shows

error (pid 4000): Server open attempt #0 failed for xxx.intern:0, giving up

or

error (pid 4056): display xxx.intern:0 could not be initialized, server may be grabbed.

I checked all the previous issues here with similar problems but couldn't get a solution.

any good ideas?

Re: xdmcp problem

Govinda_1 — Fri, 25 Feb 2005 07:07:45 GMT

try restarsting the dtlogin.rc in HP-UX.

#/sbin/init.d/dtlogin.rc stop
#/sbin/init.d/dtlogin.rc start

regards
Govinda.

Re: xdmcp problem

Michael Koops_1 — Fri, 25 Feb 2005 07:14:15 GMT

Hi Govinda

i did several times.

Michael

Re: xdmcp problem

B. Hulst — Fri, 25 Feb 2005 10:14:05 GMT

Hi,

When you are sure no one is logged onto the server then kill -9 all the running processes called dtsession. Then stop & start as suggested above. :-)

If that does not work, then brute force:

#/sbin/init.d/dtlogin.rc stop

ps -ef | grep dt
kill all the process left running there
which have dt in the begin name (dtlogin, dtsession, etc... You can find more suggestion in /usr/dt/bin/dt*

#/sbin/init.d/dtlogin.rc start

Regards,
Bob

Re: xdmcp problem

RAC_1 — Fri, 25 Feb 2005 10:29:52 GMT

Can you resolve xxx.intern properly?? to and fro?? Also run dr_dt and check for errors.

What does ~/.dt/errorlog and startlog says??

Anil

Re: xdmcp problem

John Dvorchak — Fri, 25 Feb 2005 10:41:17 GMT

This sounds like a name resolution problem. The HP boxes seem to be able to resolve, forward and reverse, the Reflection X box while the zx6000 and the suse box can't.

The hint is the error message "display xxx.intern:0 could not be initialized"

I am not sure if that is a DNS problem or not.

From the Reflection X box just try to telenet to the zx6000 box and if that works do a who -mT to see who the box really thinks you are. Name and address. Verify that name and address is correct for your Reflection X box.

Re: xdmcp problem

Michael Koops_1 — Fri, 25 Feb 2005 10:45:01 GMT

@Bob

i rebooted the machine several times to get clean processes but it didn't help

@Anil

the name resolution works in both directions without problem. dr_dt shows no warnings and no errors. the ~/.dt/-logs didn't show anything because i didn't get a login-screen.

thanx
Michael

Re: xdmcp problem

B. Hulst — Fri, 25 Feb 2005 10:49:33 GMT

Try to connect with an X terminal or eXceed or ... just in case the reflection X is not messed up.

- Bob

Re: xdmcp problem

Michael Koops_1 — Fri, 25 Feb 2005 10:52:06 GMT

@John

telnet works and who -mT shows xxx.intern, so everything seems to be as it should

thanx
Michael

Re: xdmcp problem

Alex Glennie — Fri, 25 Feb 2005 10:52:46 GMT

Not sure if this will work but ...

cp /usr/dt/config/Xconfig -> /etc/dt/config/Xconfig ...

vi -> set

Dtlogin*grabServer: False

Dtlogin*terminateServer: True

wq!

restart X .... any difference ?

Re: xdmcp problem

Michael Koops_1 — Fri, 25 Feb 2005 11:00:09 GMT

@Bob

we tried from every reflX-equipped pc and some linux-boxes and got always the same hangup

Michael

Re: xdmcp problem

RAC_1 — Fri, 25 Feb 2005 11:09:07 GMT

What is there in /var/adm/inetd.sec file??
Any restrictions there??

Anil

Re: xdmcp problem

Michael Koops_1 — Mon, 28 Feb 2005 03:56:12 GMT

Hi everybody

friday evening i tried to login from my home-pc (via isdn and router). absolutely no problems!!! this morning i got in on the second attempt. my collegues were successful too after some attempts. i didn't change anything in the configuration compared to friday afternoon. in my view it looks like a timing problem, but who is to slow or to fast? keep in mind that we have no problems with our old hpux-boxes.

greetings
michael

Re: xdmcp problem

Michael Koops_1 — Mon, 28 Feb 2005 04:06:51 GMT

@anil

just one line in inetd.sec:

dtspc allow

michael

Re: xdmcp problem

Michael Koops_1 — Tue, 01 Mar 2005 11:37:56 GMT

@alex

the changes in Xconfig didn't make any difference

michael

Re: xdmcp problem

B. Hulst — Wed, 02 Mar 2005 02:20:17 GMT

Hi,

Try using a network sniffer to see what actually is going between the two hosts.

For example ethereal has good analyzing capabilities to see perhaps why the connection does not get establish.

It helped me a few times.

Just put a laptop with windows ethereal and listen the two hosts' traffic. And then start search in the output for port 6000 (the standard X11 port)

Regards,
Bob

Re: xdmcp problem

Michael Koops_1 — Fri, 04 Mar 2005 03:12:51 GMT

Hi everybody

yesterday we solved our problem:

we found out that one of our routers runs a dns-server with factory default configuration. this dns-server responds to reverse lookup requests and provides wrong hostnames so that reflectionX couldn't work properly.

thank you all for your assistance
Michael

Re: xdmcp problem

Michael Koops_1 — Fri, 04 Mar 2005 03:16:11 GMT

see above