When there are many users logged on to a Citrix Metaframe server the 
connections to shares start to fail.  You get the popular red cross on mapped 
drives and error when saving documents to the samba server.

To reproduce you would need to 
- have a default compiled Samba installation of any version 
- get a large amount of connections from a single windows client to the samba 
server.  Typically a Citrix Metaframe server with more than 50 users with 10 
shares connected each.  

You would now start to get connection problems to shares.  Mapped drives that 
had timed out wont be able to reconnect to the share.

This error occurs on Windows 2000 Citrix Metaframe server with samba version 
2.2.6.  

It will also happen with other samba versions and all variants of Citrix 
Metaframe.

Reason of the error is when the number of shares connected to the Samba server 
from the Metaframe server raise beyond the MAX_CONNECTIONS default value 
in "smbd/conn.c".  To fix this you have to set the MAX_CONNECTIONS value to a 
larger value before compiling the source.  

conn.c:#define MAX_CONNECTIONS 256

to 

conn.c:#define MAX_CONNECTIONS 1024

Solves the problem.