Error moving mailboxes - MigrationTransientException hr=0x80004005

Question

We have an odd issue when trying to move mailboxes to Databases with Exchange 2013 Build 847.32 on all servers affected. 
We have 2013 successfully deployed within the UK (3 servers, with a DAG) we are looking to deploy an additional 2 servers in the US across an MPLS WAN. The US has it's own DAG in the US and its own MAPI network (this MAPI network is tested routable to the
UK) DAG own replication network not routable, and simply a cross over...
The Migration Arbitration mailbox is located within the UK DAG, it exists as do the other Arbitration mailboxes and everything works fine moving mailboxes across DBs in the UK...
As soon as I try and move a mailbox in the US between the two server (or even on the same server within the US) it comes up with the following error after about 20mins: Worth stressing that all migration within the UK DAG work perfectly fine... 
Error: MigrationTransientException: Failed to communicate with the mailbox database. --> Failed to communicate with the mailbox database. --> MapiExceptionMdbOffline: Unable to make connection to the server. ‎(hr=0x80004005,
ec=1142)‎ Diagnostic context: Lid: 41192 dwParam: 0x1 Lid: 63464 Lid: 34792 StoreEc: 0x6AB Lid: 51176 StoreEc: 0x80040115 Lid: 48104 Lid: 39912 StoreEc: 0x80040115 Lid: 41192 dwParam: 0x2 Lid: 55272 Lid: 34792 StoreEc: 0x6BE Lid: 51176 StoreEc: 0x80040115
Lid: 48104 Lid: 39912 StoreEc: 0x80040115 Lid: 41192 dwParam: 0x0 Lid: 49064 dwParam: 0x1 Lid: 37288 StoreEc: 0x6AB Lid: 49064 dwParam: 0x2 Lid: 38439 EMSMDBPOOL.EcPoolConnect called [length=48] Lid: 54823 EMSMDBPOOL.EcPoolConnect returned [ec=0x476][length=20][latency=796]
Lid: 53361 StoreEc: 0x476 Lid: 51859 Lid: 33649 StoreEc: 0x476 Lid: 43315 Lid: 58225 StoreEc: 0x476 Lid: 39912 StoreEc: 0x476 Lid: 54129 StoreEc: 0x476 Lid: 50519 Lid: 59735 StoreEc: 0x476 Lid: 59199 Lid: 27356 StoreEc: 0x476 Lid: 65279 Lid: 52465 StoreEc:
0x476 Lid: 60065 Lid: 33777 StoreEc: 0x476 Lid: 59805 Lid: 52487 StoreEc: 0x476 Lid: 19778 Lid: 27970 StoreEc: 0x476 Lid: 17730 Lid: 25922 StoreEc: 0x476
I assume this is looking for the Migration Arbitration mailbox in the UK, across the WAN and is failing but all other features seem to work fine... In fact if I try to migrate using the Shell on a US server, it works fine so this seems to be limited
to the Console...
WAN connectivity is fine, I have done a TCP any any on the ASAs to make sure there is full communication and everything else works fine... 
Any ideas as to why it seems to be failing to see the Arbitration mailbox? I t is also worth mentioning I have re-run the ADPREP /Alldomains to ensure there is no corruption within the Arbitration mailboxes...
I have probably missed something very simple somewhere but for the life of me can't think where... 
Any help gratefully received... 

Answer 1

Hi,
In your case, the issue should be related to ECP virtual directory in American Exchange server. I recommend you recreate ECP virtual directory and check the result.
For your reference:
New-EcpVirtualDirectory
https://technet.microsoft.com/en-us/library/dd351218%28v=exchg.150%29.aspx?f=255&MSPPError=-2147217396
Hope this can be helpful to you.
Best regards,
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Amy Wang
TechNet Community Support