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 Kumar ASr Infrastructure SpecialistCommented:
Check the DNS from both Active Directory domains are reachable.
APIAuthor Commented:
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.
Ganesh Kumar ASr Infrastructure SpecialistCommented:
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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APIAuthor Commented:
There is a two way trust between the domains, there is no firewall in between the domains, and the time is sync'd.
APIAuthor Commented:
Any one have any assistance they can provide on this topic?
Ganesh Kumar ASr Infrastructure SpecialistCommented:
Are those two exchange server belongs to same AD domain or different domain forest.

Are you able to reach the nearest domain controller from the exchange server and are you able to reach FSMO role holders.

try to run nltest /dclist to from both exchange server to get the list.

Get-ExchangeServer -status to check the Domain controller status.
APIAuthor Commented:
I resolved this by migrating the mailboxes to my exchange 2010 server with the above cmdlet and script.  Then performed a local move between the 2010 and 2013 servers.  Not sure why that's necessary but it worked.

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