[monkkey]

Попробуйте следующее:
MUP Cache
The multiple UNC provider (MUP) cache stores information about which redirector, such as DFS, SMB, or WebDAV, is required for each UNC path that a client computer attempts to access. Entries in the MUP cache are held for 15 minutes. You can use Dfsutil.exe /PurgeMupCache parameter to clear the MUP cache. This might be necessary when a folder is changed from an SMB shared folder to a WebDAV or DFS root folder or vice versa.
How DFS Works
Также есть утилита dfscmd.