X over SSH [SOLVED]

[Qchem]

Hi all,

 

I'm trying to run an X application over ssh, by process of elimination I've discovered the problem is on the server side. When I try to connect I get:

 

Molden: cannot connect to X server foo.york.ac.uk:0.0

 

where foo is the name of a client and Molden is the program I'm trying to run.

 

Looking in /var/log/messages I find lines like this:

 

Mar 16 13:24:53 qchemb su[27992]: PAM pam_putenv: delete non-existent entry; REMOTEHOST

Mar 16 13:24:53 qchemb PAM-env[27992]: Unknown PAM_ITEM: <XAUTHORITY>

Mar 16 13:24:53 qchemb su[27992]: PAM pam_putenv: delete non-existent entry; XAUTHORITY

 

Is this the cause of my problems? X forwarding is enabled in sshd_config.

[Gowator]

OK, just checking but did you xhost + on the xserver?

[Qchem]

hmm:

 

xhost thallium
xhost:  unable to open display "thallium.york.ac.uk:0.0"

 

The same client can run the same app on other servers. Odd

[Qchem]

PAM was causing the problem, this was fixed by commenting out the lines

 

REMOTEHOST DEFAULT= OVERRIDE=@{PAM_RHOST}

 

and

 

DISPLAY DEFAULT=${REMOTEHOST}:0.0 OVERRIDE=${DISPLAY}

 

in /etc/security/pam_env.conf on the server. This allows the forwarding to work, if anyone knows of a good reason why I shouldn't comment out this lines I'd like to hear about it.