[XDMCP] XDM/KDM sometimes not responding to UDP packets on port 177

Hi,

short introduction:

-Linux terminal server serving xdm/kdm login manager via XDMCP
to X (thin)clients over ethernet
-Clients are thinclients and normal x86 PCs running x.org

problem:

from time to time the login manager (xdm and kdm are both affected)
serving on the terminal server stops reading from it's received packets
queue leading to not being able to login remotely via XDMCP.

packet flow when all is fine:

client -> server:177/udp
server -> client "Willing to serve"

packet flow when the mentioned problem occurs:

client -> server:177/udp (no response, some seconds delay)
client -> server:177/udp (no response, some seconds delay)
client -> server:177/udp (no response, some seconds delay)
....

# netstat -lnp (server)
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program
udp 2800 0 0.0.0.0:177 0.0.0.0:* 2567/kdm

The size of the Recv-Q is growing accordingly to udp packets received
from clients.

Client and server are in the same subnet, no bridge or router in
between.

Server is running X.org 6.8.2, kernel 2.6.11.

Sidenote: A kill `pidof kdm` doesn't kill kdm, kill -9 is needed.

I'm a bit frustrated since googling around didn't give me much info what
could be wrong here. I would be glad if someone could point me in the
right direction.

X-Post & F'up2 comp.os.linux.networking

Greetings,
Marcel.

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Solution:

http://forums.gentoo.org/viewtopic-p...2.html#2351552

kdm/xdm is reading from /dev/random by default which causes xdm/kdm to
hang when no hdd activity, keystrokes and mouse movement is done...

Fix for KDM:

[General]
RandomDevice=/dev/urandom

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