Description of Problem:

pam_xauth doesn't copy the cookie that is actually used by xlib.

Version-Release number of selected component (if applicable):
7.2 latest upgrades, as of 17th April 2002

How Reproducible:
4 Servers, all had exactly the same problem.

Steps to Reproduce:

1. 
Log in via ssh (with X tunneling)
2. 
Su to root "su -"
3. 
Try and run an X application.

Actual Results:
It fails, because the cookie hasn't been copied.

Expected Results:
X application should run.

Additional Information:
/etc/hosts
----------------------------------------------------------------------------
127.0.0.1 localhost.localdomain localhost
192.168.0.1 MachineName
----------------------------------------------------------------------------

Changes to sshd_config (openssh from openssh-3.1p1-2)
----------------------------------------------------------------------------
Protocol 2
PermitRootLogin no
PasswordAuthentication no
X11UseLocalHost yes
----------------------------------------------------------------------------

Unclear how much these affect the problem.

X11UseLocalHost causes only 1 xauth cookie to be set (instead of two).

Basically:

If you have DISPLAY set to localhost:10, then the cookie that is used is
MachineName/unix:10, pam_xauth doesn't copy this.

-Antony