[svlug] XDMCP server issues

[Karsten M. Self]

This is mostly a "how should I go about troubleshooting" question.

Configuration:  Debian sarge i386 box, local LAN.  kdm is providing
XDMCP services.  I've got the inetd.conf hack for providing VNC sessions
with authentication through XDMCP, as outlined here, with several ports
in the range 5950 - 5954 providing different resolution sessions:

    http://www.fifi.org/doc/vncserver/README.inetd

Everything worked dandy prior to the system being moved across the lab,
modulo about two weeks (spring break).  Local console X login worked,
remote XDMCP X login worked, and remote VNC with XDMCP login worked.


Now:

  - Local X11 login via kdm works.

  - Remote X11 session with "query" or "broadcast" *doesn't* work.  The
    local X11 server starts (herringbone pattern), but the login/chooser
    screen never appears.

  - Remote VNC sesssion doesn't succeed.  The VNC session connection is
    made, the appropriate resolution (per the assigned ports above) is
    selected, and X displays its herringbone pattern.  But no kdm login
    appears.


I've looked for any output in system logs, and there simply doesn't
appear to be any.  'find /var/log -type f -maxdepth 2 -mtime -2 -print0
| xargs -0 grep kdm' turns up a few false positives.  No logfiles appear
to be written as the session starts.  I'm sort of stuck for diagnosing
this.  Is there any way to increase verbosity of either the VNC server
or kdm?

Subsequently I've found the following post via Google which suggests
font path issues.  I believe there's been a system upgrade since the
last successful logins, which may account for the changes.


I'm considering a few options for further diagnostic:

  - Network traffic sniffing:  watching communications to the kdm / vnc
    server.  Since the traffic _should_ be localhost, I'm pretty
    confident there are no firewall issues involved.

  - Using a different X display manager.  This idea didn't occur to me
    until leaving the lab (won't be back until Monday) but might be
    useful.

Other suggestions welcomed.


Peace.

-- 
Karsten M. Self <kmself at ix.netcom.com>        http://kmself.home.netcom.com/
 What Part of "Gestalt" don't you understand?
  Good thing the users aren't developing Galeon, or it'd be a huge, disgusting
  pile of garbage. Hell, even Internet Explorer would be an improvement.
  - Adam Hooper, explaining the tradition of user involvement in GNOME
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