I have been able to promote windows server 2003 r2 to domain controller after running the adprep on the existing windows 2000 domain controller that held all the 5 fsmo roles.The problem I am facing is when firewall is enabled on the windows 2003 r2 server event id 13509 and 13508 is recorded preventing replication from 2003 server to the other 2 2000 domain controllers.Any idea