----------------------------------------
On Global Catalog(s) 
----------------------------------------
Key:	HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\NTDS\Parameters
Multi-string Value Name:	NSPI interface protocol sequences
Multi-string Value Data:	ncacn_http:6004




---------------------------
On Exchange Server 2003 SP1
---------------------------
Key: 		HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Rpc\RpcProxy
String Value:	ValidPorts


Ports: 
------
593
6001-6002
6004

--------
Servers:
--------
(Exchange 2003)
E2k3
E2k3.net.local

(Global Catalog(s) - Should be 2003 server)
DC64
DC64.net.local

(External DNS name - used in SSL Certificate and OWA)
web2.netometer.com