Exchange 2003 to 2010 Migration fails

I need to move Mailboxes from a Exchange 2003 Server in one Domain into an Exchange 2010 Server in another Domain (Cross Forest).

The Prepare-MoveRequest Script works like a charm, but the New-MoveRequest fails:
Failed to reconnect to Active Directory server Make sure the server is available, and that you
have used the correct credentials.
+ CategoryInfo : NotSpecified: (:) [], ADTransientException
+ FullyQualifiedErrorId : 58305869

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