WinXP can't connect to network shares after a certain time

[Borutra 0]

I'm using Windows 2000 Server (as a PDC and the only domain controller) on my network. I have Windows NT, Windows 2000 and Windows XP Pro clients.

 

When I log on to the domain with a XP client all the network shares (and printers) work OK for a certain amount of time (I don't know exactly how long 30min-1hour) but after that they stop working. If I try to connect to a network share I get this error message:

 

The system detected a possible compromise in security. Please ensure that you can contact the server that authenticated you.

 

If I log out and then log in again, everything works again. I don't have any problems with NT and 2000 clients and the domain server itself is available all the time.

 

Any ideas? Thx in advance,

 

Borut