Posted in : Exchange By Joel Jerkin Translate with Google ⟶

6 years ago

Recently in an Exchange Hybrid environment with Exchange Server 2016 on-premise and Exchange Online in Office 365 I encountered the following error message when trying to move a mailbox from on-premise to Exchange Online using New Migration Batch on Remote MRS proxy server:
”The connection to the server ’’ could not be completed”

On the on-premise Exchange Server I ran the Test-MigrationServerAvailability command with the following parameters to verify the availability with migrating cross-forest:

Test-MigrationServerAvailability -ExchangeRemoteMove -Autodiscover -EmailAddress -Credentials (Get-Credentials)

The result returned with Failed and looking at the error message, we can see the following:
The call to ’’ failed”.
Trying manually to go to the URL, it returned with an error code of: ”Server Error in ’/EWS’ Application.”
Normally it would have returned ”The webpage cannot be found” with an 404 error code.
Going to the on-premise Exchange Admin Center, Servers > Virtual Directories > EWS (Default Web Site) I wanted to verify that MRS is enabled for that server – but as the picture shown below, it wasn’t.
I enabled the MRS Proxy Endpoint for the server by selecting the checkbox and press Save:

Restarting the WebAppPool MSExchangeServersAppPool on the specific server using the following command to make sure everything applied and any cache are cleared:

Restart-WebAppPool MSExchangeServicesAppPool

Going again to the URL I now received the correct ”error code” of ”The webpage cannot be found” and 404.

Rerunning the Test-MigrationServerAvailability command, I now received a Success as the result:
Going back to the new migration batch, I could now proceed with the move of the mailbox to Exchange Online.

Tags : Exchange, Exchange Server, Hybrid, Office 365

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Magnus Rönnberg says

If you have installed request filtering in iis, you have to allow the .svc extension to be served, or else youll end up with a 443 response

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