I have seen on another list that in a domain, all Windows Servers 2003 should be updated to SP1 BEFORE the Windows Servers 2003 Domain Controllers. Also, all Windows Servers 2003 Domain Controllers must be updated to SP1 as quickly together as possible. I am wondering how the domain is effected if there are fixed domain controllers, such as 1 Windows Server 2003 and 1 Windows 2000 server. John T eServices For You -----Original Message----- From: Andrew English [mailto:andrew@xxxxxxxxxxxxxxxxxxxxxx] Sent: Sunday, April 17, 2005 5:16 PM To: [ISAserver.org Discussion List] Subject: [isalist] RE: Windows 2003 SP1 http://www.ISAserver.org Jim, How come all it took was for me to join the server that was going to run ISA 2004 Server running Windows 2003 Server non-SP1 to a SP1 Windows network; Windows Update to produce the RPC issue? ISA 2004 was not installed as of yet. Sounds like its more of a Windows thing than it is and ISA thing to me. I have tested this on VM Servers, and on non-VM Server and received the same results in both cases. Maybe Microsoft failed to do complete tests in their labs. Andrew All mail to and from this domain is GFI-scanned.