Could not Copy Data to View Storage

We have experiencing some strange behavior of ClearCase dynamic view from some developers these few days.

The vob server is on Unix, the view storage is located locally on developers desktop. We use TAS as the interop solution. When some developers tried to check out, the ClearCase explorer reported: "The element is checkout, but could not copy to view storage". We checked everything, and finally narrowed down the behavior to Windows 2000 users. And we found out that when they try start-> run-> "\\10.2.194.153\ccstore", it prompt for id/password logon.

The problem can be solved by a reboot, or explicitly run "net use * \\10.2.194.153\cctore" command. It seems that the networking setting has been changed, the cached data is no longer valid.