Exchange 2010 to Exchange 2010 migration

We are looking to move Exchange 2010 from one server to another server. Both servers are joined to the same domain and connected over VPN's.

Server A is connected to the DC's subnet via a VPN. Server B is connected to the DC's subnet via a different VPN. Server A cannot directly talk to Server B.

--Server A-- (pre-existing Exchange server)
Exchange 2010 (CAS, Mailbox, Hub)
Joined to domain.local

--Server B-- (new Exchange server)
Exchange 2010 (CAS, Mailbox, Hub)
Joined to domain.local

I can see all objects that exist on Server A from the EMC on Server B.

EMC in Server B showing error on Server A database.
I also get the following error when attempting to move a mailbox:

Summary: 1 item(s). 0 succeeded, 1 failed.
Elapsed time: 00:00:27


MapiExceptionNetworkError: Unable to make connection to the server. (hr=0x80004005, ec=2423)
Diagnostic context:
    Lid: 16280   dwParam: 0x6BA      Msg: EEInfo: ComputerName: n/a
    Lid: 8600    dwParam: 0x6BA      Msg: EEInfo: ProcessID: 2192
    Lid: 12696   dwParam: 0x6BA      Msg: EEInfo: Generation Time: 2015-10-08 19:37:26:900
    Lid: 10648   dwParam: 0x6BA      Msg: EEInfo: Generating component: 18
    Lid: 14744   dwParam: 0x6BA      Msg: EEInfo: Status: 10060
    Lid: 9624    dwParam: 0x6BA      Msg: EEInfo: Detection location: 318
    Lid: 13720   dwParam: 0x6BA      Msg: EEInfo: Flags: 0
    Lid: 11672   dwParam: 0x6BA      Msg: EEInfo: NumberOfParameters: 0
    Lid: 53361   StoreEc: 0x977    
    Lid: 51859  
    Lid: 33649   StoreEc: 0x977    
    Lid: 43315  
    Lid: 58225   StoreEc: 0x977    
    Lid: 50835  
    Lid: 62321   StoreEc: 0x977    
    Lid: 47987  
    Lid: 50033   StoreEc: 0x977    
    Lid: 52465   StoreEc: 0x977    
    Lid: 60065  
    Lid: 33777   StoreEc: 0x977    
    Lid: 59805  
    Lid: 52209   StoreEc: 0x977    
    Lid: 56583  
    Lid: 52487   StoreEc: 0x977    
    Lid: 19778  
    Lid: 27970   StoreEc: 0x977    
    Lid: 17730  
    Lid: 25922   StoreEc: 0x977    

Exchange Management Shell command attempted:
'domain.local/domain/Users/AOCC' | New-MoveRequest -TargetDatabase 'Mailbox Database 0050355239'

Elapsed Time: 00:00:27

My questions are:

1. Am I going about this in the easiest way, most non-intrusive way?
2. After I move all the mailboxes will I need to do anymore configuring on the server (all configurations on Server B seem to be accurate).
3. Do the servers need to have a VPN between them and not just the DC's subnet?
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AmitIT ArchitectCommented:
Screeshot shows your target server is down. Check if all Services are running and db is mounted.
aandoAuthor Commented:
The exchange server with the "servicedown" database is in production and fully functional.
AmitIT ArchitectCommented:
I don't think you have required port opened between both servers. As Server is not reachable, I guess this is not a DAG.
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David Johnson, CD, MVPOwnerCommented:
easier just to stop exchange and then move the mailbox databases instead of just the individual mailbox
aandoAuthor Commented:
So my work flow would be the following?

1. Dismount the database
2. Ensure database is in a clean shut down state.
2. Move the database from Server A to Server B
3. Mount the database on Server B
4. Shutdown and kill Server A

Will I need to remove anything in AD regarding Server A or let it be? Will I need to reconnect the mailboxes to the AD accounts?
aandoAuthor Commented:
The servers are not in a DAG.
AmitIT ArchitectCommented:
How you are going to move db if servers are not reachable. Also you need downtime to move db. Moving  mailbox is much easier. Focus on fixing communication between server.
Kim HartCommented:
Checkout the below given informative resource that covers the deployment issues with their solutions which might be helps you to get this job done:

MapiExceptionNetworkError: Unable to make connection to the server. (hr=0x80004005, ec=2423):

You may also take help from this earlier discussed thread having suggested solutions -
aandoAuthor Commented:
I have rectified the connection issues by establishing a VPN directly between the servers. I am now able to move mailboxes from one database to another.

Email, however, is not being delivered to the mailboxes after the database move. In addition, I can only check OWA if I use the server where the mailbox is stored.

How can I configure exchange to allow access to the mailbox on Server B from Server A?

What do I need to do to get mail destined for Server A to flow to the mailbox on Server B?
You've created a mess for yourself by not planning  this out.

Odds are, your MX records are pointed to server A, and not server B.  Figure out the mail flow issue, then move what is populated on the old server.

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