I have two Server, Server 1 is my Active Directory and Server 2 is my additional domain controller with ISA Serverr 2006 installed, here the Error
(There are warning or error events within the last 24 hours after the SYSVOL has been shared. Failing SYSVOL replication may cause Group policy problem.)
The File Replication Service is having trouble enabling replication from ISA_SERVER to SNCLI_SERVER for c:\windows\sysvol\domain using the DNS name isa_server.sncli.com. FRS will keep retrying.
Following are some of the reasons you would see this warning.
 FRS can not correctly resolve the DNS name isa_server.sncli.com from this computer.
 FRS is not running on isa_server.sncli.com.
 The topology information in the Active Directory for this replica has not yet replicated to all the Domain Controllers.
This event log message will appear once per connection, After the problem is fixed you will see another event log message indicating that the connection has been established.