move-mailbox from forest A exchange 2003 to Forest B exchange 2010

i got this error after  any idea ?

Get-MailUser "usertest" |New-MoveRequest -RemoteLegacy -TargetDatabase "test01" -baditemlimit 10 -RemoteGlobalCatalog $remoteGC -RemoteCredential $remoteCredentials -TargetDeliveryDomain $domainTarget

MapiExceptionNetworkError: Unable to make connection to the server. (hr=0x80004005, ec=2423)
Diagnostic context:
    ......
    Lid: 15000   dwParam: 0x6BA      Msg: EEInfo: prm[2]: Pointer val: 0x51C8A8C000000000
    Lid: 16280   dwParam: 0x6BA      Msg: EEInfo: ComputerName: n/a
    Lid: 8600    dwParam: 0x6BA      Msg: EEInfo: ProcessID: 19796
    Lid: 12696   dwParam: 0x6BA      Msg: EEInfo: Generation Time: 2015-01-14 20:21:54:210
    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: 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 : FBB4FBA6,Microsoft.Exchange.Management.RecipientTasks.NewMoveRequest