Recently during an Exchange 2003 to Exchange 2010 migration we were trying to move the mailboxes to Exchange 2010, after repeated tries we kept getting the same error
Event Viewer didn’t reveal much about the error message, to troubleshoot further we executed simultaneous WireShark traces on Exchange 2003 and Exchange 2010 servers.
The network traces found that Exchange 2010 server is trying reach out to Exchange 2003 on port 6001.
We went ahead and opened the required port on the firewall, after which mailbox move worked fine.
I would suggest testing with Firewall turned off, Incase Port 6001 doesn’t resolve your issue, to ensure its a network problem.
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