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Exchange hybrid - migration endpoint could not be created RRS feed

  • Question

  • Hi all,

               Exchange 2016 on premise - with an exchange 2019 hybrid server.

    Majority of mailboxes have been migrated to exchange online, but there are a few stragglers on-premise.

    Approx 1 week ago, the hybrid connection seemed to break, we could no longer migrate users into the cloud.

    Test-MRSHealth indicates that the local MRS is all healthy. Running test-migrationserveravailability comes back with errors.

    In order to try and rectify this, i have re-run the HCW and am consistently getting this error

    2019.09.07 23:23:57.337 WARNING 10026 [Client=UX, Page=Configuring, fn=RunWorkflow, Thread=8] 
                                          HCW8078 Migration Endpoint could not be created.  
                                          Microsoft.Exchange.Migration.MigrationServerConnectionFailedException
                                          The connection to the server '9313b9b6-3070-4c93-bd77-3d2ddc09517c.resource.mailboxmigration.his.msappproxy.net' could not be completed.
                                          Microsoft.Exchange.MailboxReplicationService.MRSRemoteTransientException
                                          The call to 'https://9313b9b6-3070-4c93-bd77-3d2ddc09517c.resource.mailboxmigration.his.msappproxy.net/EWS/mrsproxy.svc' timed out. Error details: The request channel timed out while waiting for a reply after 00:00:09.9989415. Increase the timeout value passed to the call to Request or increase the SendTimeout value on the Binding. The time allotted to this operation may have been a portion of a longer timeout. --> The remote server returned an error: (504) Gateway Timeout. --> The remote server returned an error: (504) Gateway Timeout.
                                          Microsoft.Exchange.MailboxReplicationService.MRSRemotePermanentException
                                          The request channel timed out while waiting for a reply after 00:00:09.9989415. Increase the timeout value passed to the call to Request or increase the SendTimeout value on the Binding. The time allotted to this operation may have been a portion of a longer timeout.
                                          Microsoft.Exchange.MailboxReplicationService.MRSRemotePermanentException
                                          The remote server returned an error: (504) Gateway Timeout.
                                          Microsoft.Exchange.MailboxReplicationService.MRSRemotePermanentException
                                          The remote server returned an error: (504) Gateway Timeout.

    if i navigate to https://9313b9b6-3070-4c93-bd77-3d2ddc09517c.resource.mailboxmigration.his.msappproxy.net/EWS/mrsproxy.svc from a browser on the hybrid server, i can get to the page (which is declined - but its still getting there)

    wireshark logs show no issues.

    Im not quite sure what to check next at this stage - any suggestions ?

    Saturday, September 7, 2019 11:30 PM

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