topic Re: Not able to export DISPLAY with March 2009, 11.31. in Operating System - HP-UX

Not able to export DISPLAY with March 2009, 11.31.

Narendra Thapa — Wed, 05 Aug 2009 09:26:51 GMT

This really strange but I am not able to export display with march 2009 11.31.

I am able to export display with other OS before march 2009 but with this particualre OS relase (March 09 11.31) I am not able to do so.

I don't no what to do because in some of the linux (suse)nodes display work fine.

STEPS TO EXPORT DISPLAY:
1. I go to a linux box and export DISPLAY for HP-UX box.

Eg.

ssh -X root@hpuxhost1

With other OS release display is automatically export if I login in the above way or I can export the display after logging in linux box.

Eg.

export DISPLAY=linux1:0.0

But my display is not working with the March 2009 11.31 release and with the same commands I am able to export DISPLAY for other OS release (Eg. other 11.31 release before March 2009 and 11.31 all release.

Its really strange but annoying for me because I really did almost everything but I am not getting what is wrong.

Can anyone please help me out of this. :)

Re: Not able to export DISPLAY with March 2009, 11.31.

Narendra Thapa — Wed, 05 Aug 2009 09:30:42 GMT

It just throws the following message after exporting the DISPLAY:

# xclock
Error: Can't open display:
Error: Couldn't find per display information

Re: Not able to export DISPLAY with March 2009, 11.31.

Asif Sharif — Wed, 05 Aug 2009 09:51:06 GMT

Hi,

Did you install CDE?

Regards,
Asif Sharif

Re: Not able to export DISPLAY with March 2009, 11.31.

Narendra Thapa — Wed, 05 Aug 2009 09:54:24 GMT

I have not install anything extra besides OS installation.

I think CDE is installed by default with the OS or I need to install it manually for March 2009, 11.31.

Re: Not able to export DISPLAY with March 2009, 11.31.

Narendra Thapa — Wed, 05 Aug 2009 10:11:41 GMT

CDE is installed in the machine.

# swlist -l product | grep -i cde
CDE B.11.31 HP-UX CDE User Interface

Re: Not able to export DISPLAY with March 2009, 11.31.

Turgay Cavdar — Wed, 05 Aug 2009 10:36:52 GMT

Check if dtlogin is running:
ps -ef | grep dtlogin

If not enable it with:
/usr/dt/bin/dtconfig -e

And then start:
/sbin/init.d/dtlogin.rc start

Re: Not able to export DISPLAY with March 2009, 11.31.

Narendra Thapa — Wed, 05 Aug 2009 10:43:10 GMT

dtlogin is enabled and started in the system.

# ps -ef | grep dtlogin
root 2294 2274 0 16:38:39 ? 0:00 /usr/dt/bin/dtlogin
root 4635 4531 0 17:11:08 pts/1 0:00 grep dtlogin

Re: Not able to export DISPLAY with March 2009, 11.31.

OldSchool — Wed, 05 Aug 2009 15:21:21 GMT

export DISPLAY=linux1:0.0

are you sure that's the same display as used elsewhere? Usually, tunnelled X uses an "offset", where the name would be something like:

DISPLAY=linux1:10.0

Re: Not able to export DISPLAY with March 2009, 11.31.

Narendra Thapa — Wed, 05 Aug 2009 15:28:19 GMT

Yes ..!!
As I said I am able to export DISPLAY with other HP OS releases .... 11.23 or 11.31 before March 2009, 11.31.

I am facing this issue with this particular OS only.

I don't no why I am facing this issue. :(

Re: Not able to export DISPLAY with March 2009, 11.31.

Alex Glennie — Wed, 05 Aug 2009 16:02:22 GMT

As I said I am able to export DISPLAY with other HP OS releases .... 11.23 or 11.31 before March 2009, 11.31.

Perhaps it's specific to this host and not the O/S version ...

Error: Can't open display:
Error: Couldn't find per display information

I beleive the above is telling you it can't "resolve" linux1:0.0 ....

have you tried using an ip ?

are you sure name resolution is working on both hosts ?

are you using DNS or files lookup on linux1

Re: Not able to export DISPLAY with March 2009, 11.31.

Narendra Thapa — Wed, 05 Aug 2009 16:08:35 GMT

Actually I have lots of HP servers with diff OS and March 09 11.31 is the latest we have and we are testing some features before implementing it.
But I am not able to export the display ... and about name resolution... all is ok with name resolution as I am running same command to export display with other nodes with other OS and its all working fine with others .

:)

Please suggest.

Re: Not able to export DISPLAY with March 2009, 11.31.

Alex Glennie — Wed, 05 Aug 2009 16:12:58 GMT

and about name resolution... all is ok with name resolution as I am running same command to export display with other nodes with other OS and its all working fine with others

well the syntax is correct I'll grant you.

Re: Not able to export DISPLAY with March 2009, 11.31.

Steven E. Protter — Wed, 05 Aug 2009 16:15:57 GMT

Shalom,

HP-UX 11.31 has never installed CDE by default. You have to check it off.

This fools experienced systems administrators on HP-UX because they are used to a default installation of CDE.

The failure of the export to a linux system may be from the following cause:

1) The default Linux firewall prevents traffic on port needed for CDE.
2) The Linux display is protected try xhost + on the Linux system to allow the traffic.

ssh -X hpux_host
#should work. If not try:
ssh -Y hpux_host

The command will not work until after CDE is installed.

ssh -Y does not work when pointed at a Linux host.

SEP

Re: Not able to export DISPLAY with March 2009, 11.31.

Narendra Thapa — Wed, 05 Aug 2009 16:16:53 GMT

yes ... name resolution is ok.

Re: Not able to export DISPLAY with March 2009, 11.31.

Narendra Thapa — Wed, 05 Aug 2009 16:31:06 GMT

Hi SEP,

I am using exactly the same commands which you suggested to export DISPLAY of my hpux nodes using my linux nodes.

But still I am not able to export the display.

STEPS:
1. ssh -X hpux_host (login to linux host)
2. run xclock to check the display is working or not.
3. It fails and I manually export the display.
export DISPLAY=linux_host:0.0.
4. Still display does not work.

What I believe is may be some firewall setting from HP-UX (March 09, 11.31) is preventing it, but I am not sure.

Re: Not able to export DISPLAY with March 2009, 11.31.

Alex Glennie — Wed, 05 Aug 2009 17:03:31 GMT

what happens if you use an ip address instead of linux1 when exporting the DISPLAY ?

Re: Not able to export DISPLAY with March 2009, 11.31.

Tingli — Wed, 05 Aug 2009 17:24:03 GMT

How about the 0.0? Is there already another X window opened in the linux?

Re: Not able to export DISPLAY with March 2009, 11.31.

Narendra Thapa — Thu, 06 Aug 2009 06:17:53 GMT

I already tried with IP also but still I am not able to export display.

And there are no other X window opened in the linux.

Thanks.

Re: Not able to export DISPLAY with March 2009, 11.31.

Alex Glennie — Thu, 06 Aug 2009 17:55:18 GMT

To help try to understand your problem could you

post :

detail ip address and fqdn of linux system and for hpux.

On linux box run nslookup on both ip & hostname of unix box. Post output.

On hpux server run nslookup of ip and hostname of linux system. Post output.

on linux server ssh to unix server and run

echo $DISPLAY ... post output & syntax of commands used.

export DISPLAY to ip.addree:0.0 of linux server.

run xhost
post results.
run xclock
post results.

What has been done to allow X11 forwarding as in ....

-X Enables X11 forwarding. This can also be specified on a per-host basis in a configuration file.

I'd of thought you'd get an X connection refused if this were ssh or a firewall issue. X is likely to be going thru port 6000.

Has this system been upgraded previously to the current O/S (the unix server).

Re: Not able to export DISPLAY with March 2009, 11.31.

Narendra Thapa — Fri, 07 Aug 2009 05:45:14 GMT

IP Address and name resolution (DNS Server)are working perfectly all right.

*** NOTE: IP/NAME of machines are changed to keep the privacy.

IP Address of Linux box.
10.209.72.25

IP Address of HP-Server
10.209.72.145

# nslookup mylinux
Name Server: mydns.abc.com
Address: 10.209.72.100

Trying DNS
Name: mylinux.abc.com
Address: 10.209.72.25

# nslookup hphom2

Name Server: mydns.abc.com
Address: 10.209.72.100

Trying DNS
Name: hphom2.abc.com
Address: 10.209.72.145

When I do a ssh -X hphom2 and login.

# echo $DISPLAY

Nothing is seen.

# xclock
Error: Can't open display:
Error: Couldn't find per display information

Exported display with machine name.
# export DISPLAY=mylinux:0.0
# echo $DISPLAY
mylinux:0.0

# xclock
Error: Can't open display:
Error: Couldn't find per display information

Exported display with IP Address.
# export DISPLAY=10.209.72.25:0.0
# echo $DISPLAY
10.209.72.25:0.0

# xclock
Error: Can't open display:
Error: Couldn't find per display information

I am not getting why am not able to export the display as with other HP-OS I am able to export the display with the same commands.

I can not say its a firewall issue as with other HP-OS I am able to export the display with the same linux machine and using same commands. :)