samba - Oct 2002 - XP-Problem - suddenly XP canot connect to samba

Hi,

we had an XP computer running and connection to our
Samba -Server (Debian Version, 2.2.3 ) was working very fine.

Suddenly - the person who is working on that computer
changed something, but could not remember what -
the XP computer cannot see the samba server anymore.

In the windows network there is no samba server visible
Also "searching for the computer" does not work either
via netbios name and ip adress
The samba computer is still invisible

Tcpdumping on the samba computer shows no port 137,138,139
connections. Only connection from the xp computer to 224.0.1.22
(srvloc.mcast.net) we can see.

What happend to the XP computer ?

We tried everything. Checking TCP/IP , Registry, nearly everything,
but no way.

What could happend to the XP computer ??

We also deinstalled XP SRV Pack 1 ...

Please Help.

Thanks a lot.

Bernd