Run FRSDiag against the domain controller and verify the junction points by viewing Ntfrs_sysvol.txt. The junction points look similar the following:
12/06/2001 02:53p <DIR> .
12/06/2001 02:53p <DIR> ..
12/21/2000 10:10a <JUNCTION> Contoso.COM
0 File(s) 0 bytes
If <JUNCTION> exists, do the following:
If <JUNCTION> does not exist, note that FRS does not function without the junction point. To correct this, perform the following procedure.
If this procedure does not fix the issue, contact Microsoft Product Support Services to discuss other methods of restoring the junction point. One possible procedure is a nonauthoritative restore, which will fix the junction point but will require the entire replica tree to be replicated to this server. You can prestage the data to avoid replicating data across the network.
For more information about SYSVOL junction points, see article 324175, "Best Practices for SYSVOL Maintenance" at http://support.microsoft.com/?id=324175.