http://www.petri.co.il/forums/showthread.php?t=7242

Try to get your hands on one of the clients that is experiencing the problem and run on it klist.exe or kerbtray.exe (both are part of W2K/W2K3 Resource Kit) to verify that the client is not experiencing problems with renewing it’s Kerberos ticket (both TGT and session tickets)

Try to get your hands on one of the clients that is experiencing the problem and run on it klist.exe or kerbtray.exe (both are part of W2K/W2K3 Resource Kit) to verify that the client is not experiencing problems with renewing it’s Kerberos ticket (both TGT and session tickets)