Exchange 2003 Server will not Upgrade Exchange Virtual Server (RPC Server is unavailable)

Greetings,

I have 2 Exchange 2003 Server that are a part of an Windows 2003 Cluster.  They have been upgraded from windows 2000 exchange 2000 to all 2003.

All of the resouces on the cluster are online (Shares, DT, IP, Network Names and Physical Disk).  Only the Exchange resources are offline and the "Microsoft Exchange System Attendant" if failed.

If I attempt to "Bring Online" the System Attendant it get this error.
----Cluster Administrator----------------------- X
An Error occured attempting to brint the 'Exchange System Attendant' resource online.
The cluster resource could not be brought on line by the resouce monitor.
Error ID: 5018 (0000139a)
----------  OK  -----------------------------------

If I attemp to "Upgrade Exchange Virtual Server" on the Exchange group I get this error.
----Microsoft Exchange Cluster Extension -----  X
Setup encountered an error while checking prequisites for the componet "Microsoft Exchange Server"; 0XC00706BA (1722): The RPC server is unabailable.
Facility: Microsoft Exchange Cluster Administrator Extension
ID no: c103fc97
Microsoft Exchange Cluster Administoratio Extension
-----------  OK  -----------------------------------

Remote RPC service is running on both of the nodes in the cluster.
I can move the cluster to the other node and the all of the other resouces go online fine.
All Servers are updated Windows Server (SP1 +rest) and Exchange (SP2 +rest)

I need more Ideas on how to get this Exchange 2003 Cluster ONLINE.

Thank you!!