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Old 02-01-2005, 07:35 AM   #1
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Registered: Feb 2005
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xdmcp and gdm problems

I've got two computers, both running Debian, gdm and XFree86. I've tried to configure them identically (gdm.conf, host.allow, /etc/init.d/gdm, etc) I'm trying to connect to them via xdmcp from two different computers (one Solaris and one Windows).
One ot the computers work fine, I get the gdmlogin screen when I do a "X -query firstmachine", on the other (gurkan) I just get a gray screen.

This is the output from netstat:
gurkan:~# netstat -nap | grep gdm
udp 0 0* 1968/gdm
so it seems to be listen on the right port. When I try to connect to this computer (gurkan) snort gives me this:
gurkan:~# snort -v port 177
Running in packet dump mode
Log directory = /var/log/snort

Initializing Network Interface eth0

--== Initializing Snort ==--
Initializing Output Plugins!
Decoding Ethernet on interface eth0

--== Initialization Complete ==--

-*> Snort! <*-
Version 2.2.0 (Build 30)
By Martin Roesch 
02/01-13:18:44.509603 ->
UDP TTL:113 TOS:0x0 ID:50953 IpLen:20 DgmLen:35
Len: 7

02/01-13:18:44.510012 ->
UDP TTL:64 TOS:0x0 ID:6 IpLen:20 DgmLen:57 DF
Len: 29

02/01-13:18:46.405311 ->
UDP TTL:113 TOS:0x0 ID:52879 IpLen:20 DgmLen:115
Len: 87

02/01-13:18:46.405719 ->
UDP TTL:64 TOS:0x0 ID:7 IpLen:20 DgmLen:80 DF
Len: 52
In other words, it seems to send four packages back-and-forth, and then nothing.

Also, when doing a "X :1 -query localhost" on that machine (gurkan) it works fine.

Anybody got any suggestions what might be wrong?



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