Saturday, July 21, 2012

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

When performing cross-forest mailbox moves you will experience an error if your Exchange 2010 server cannot resolve BOTH the FQDN and NetBIOS name of your remote Exchange server and Global Catalog.  This error can occur when performing a cross-forest mailbox move from Exchange 2010, Exchange 2007 (SP2 and above) and Exchange 2003 SP2.  Provided you have already run the Prepare-MoveRequest.ps1 script, when attempting the mailbox move the following error may be experienced:

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: 2888
    Lid: 12696   dwParam: 0x6BA      Msg: EEInfo: Generation Time: 2012-07-21 10:56:50:629
    Lid: 10648   dwParam: 0x6BA      Msg: EEInfo: Generating component: 18
    Lid: 14744   dwParam: 0x6BA      Msg: EEInfo: Status: 11001
    Lid: 9624    dwParam: 0x6BA      Msg: EEInfo: Detection location: 320
    Lid: 13720   dwParam: 0x6BA      Msg: EEInfo: Flags: 0
    Lid: 11672   dwParam: 0x6BA      Msg: EEInfo: NumberOfParameters: 1
    Lid: 8856    dwParam: 0x6BA      Msg: EEInfo: prm[0]: Unicode string: kbombserver.kbomb.local
    Lid: 45169   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
    + CategoryInfo          : NotSpecified: (0:Int32) [New-MoveRequest], RemoteTransientException
    + FullyQualifiedErrorId : 724FCAC2,Microsoft.Exchange.Management.RecipientTasks.NewMoveRequest

In this environment I could resolve my Exchange 2007 server from my Exchange 2010 server through NetBIOS name however not through FQDN.  Remember, you need to be able to resolve both.

There are a few ways you can make the FQDN resolve, these include DNS, Host File or a DNS Suffix on the server.  I simply added a zone file in DNS for my Exchange 2010 forest to allow me to complete the cross-forest mailbox moves.

I can now resolve both NetBIOS and FQDN of my Exchange 2007 server.

After being able to resolve both the NetBIOS and FQDN, the mailbox move completes successfully.


  1. Thanks, that fixed the problem for us - just made some entries in the HOSTS file.

  2. I added the server full FQDN name onto the host file of the exchange box.. And it works like a charm.

  3. Hi,

    I am still getting the same error (ec=2423), I can ping NetBios name and FQDN. Please help.