XP Pro SP2 and server 2003 issue

Archived from groups: microsoft.public.windowsxp.basics (More info?)

We have a number of brand new Dell PC's, all running XP Pro SP2 to
replace a number of Win2K machines. On these machines we have a program
that runs across the network and it all works fine - for 30 minutes. It
then hangs, and displays a logon box to log back into windows (and
access the data).

We've checked the settings in XP and all seem fine, but can't see where
it says "disconnect at 30 mins". The program runs fine under Win2K.

The server is Windows 2003 server.

Any ideas of what else to check ?

Thanks,
Nick.