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Migration from Exchange 2007 to 2013 New-MoveRequest error

I am having an issue completing a move request in a cross-forest migration.  I was able to perform the Prepare move request and now trying to complete it with the following command and results:

Import-Csv users.csv | New-MoveRequest -Remotelegacy -TargetDatabase “Mailbox Database Name” -baditemlimit 100 -acceptlargedataloss -RemoteGlobalCatalog SourceDomainName.local -TargetDeliverydomain TargetDomainName.local  –verbose

An Active Directory Error 0x51 occurred when trying to check the suitability of server "FQDN".  Error: Active Directory response: The LDAP server is unavailable.

I have found many references to the AD error 51 and tried a lot of the fixes to no avail.  There is a 2 way trust, an AD account with permissions to complete the task, all pre-reqs met, etc.  I don't know where to continue to resolve this error as all of the articles and such I have found for assistance have not pointed me in the right direction.  Any suggestions would be greatly appreciated.
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Ganesh Anand
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Check the DNS from both Active Directory domains are reachable.
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ASKER

Thanks for your reply, but I'm not sure I understand the comment.  Where am I trying to confirm that DNS in reachable from?  By reachable what do you mean?  I can ping DNS names of servers in each domain from the other.  Please elaborate.
I doubt the issue could be trust between both the domains. There should be bi-directional trust in order to have smooth migration.

CHeck the firewall ports allowed between both server if possible turn off the firewall.

Check the time sync between both domains
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There is a two way trust between the domains, there is no firewall in between the domains, and the time is sync'd.
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Any one have any assistance they can provide on this topic?
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Ganesh Anand
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