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 dc.sourcedomain.com. Make sure the server is available, and that you
have used the correct credentials.
+ CategoryInfo : NotSpecified: (:) [], ADTransientException
+ FullyQualifiedErrorId : 58305869


Finally after a lot of searching, we found out, that the Target Server was not able to disovcer the source DNS SRV Record
_ldap._tcp.sourcedomain.com

nslookup
Default Server: dc01.targetdomain.com
Address: 10.0.0.1

> set type=srv
> _ldap._tcp.sourcedomain.com
Server: dc01.targetdomain.com
Address: 10.0.0.1

*** dc01.targetdomain.com can't find _ldap._tcp.sourcedomain.com: Non-existent domain
> exit

After I fixed this DNS issue, the MoveRequests runs now.

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