[Samba] Samba server crashes when logging in at XP

[Gottfried Siehs]

Hello, 

in our school I have installed Debian Sarge with Samba 3.0.14a  
and LDAP. Everything worked fine as long as we used Windows  
98SE. 
Now I have installed Windows XP Prof SP2 (with recommended  
registry patches). I am able to join the workstations to the  
domain (after commenting out "ldap_filter ..." in smb.conf). I  
am able to login from each workstation, everything seemed to  
be fine. 
But if two or more workstation log in at the same time (I mean  
they press "enter" at the login window at the same time) the  
server crashes. It is not possible to login even from Windows  
98. 
ps shows me that there are some smbd processes hanging. If I  
execute "/etc/init.d/samba stop" they are still there and I  
have to KILL them. After doing it I can restart Samba and use  
the network. 

The only error message I can find in the log files is 

"getpeername failed. Error was Transport endpoint is not  
connected" 

and 

"could not connect to any ldap server" (after the crash). 

Please help me - I have looked through the configuration files  
many times and I really do not know WHERE to search! 

Many thanks!