MRS Proxy Error ‘The connection to the server could not be completed’

KB ID 0001358


When attempting a cross forest mailbox migration, When specifying the ‘Remote MRS Proxy Server address’ you get the following error;

MRS Error-The connection to the Server Could Not Be Completed


the connection to the server ‘server-fqdn‘ could not be completed


This tripped me up for quite a while, (it kept saying access denied). I’d tested this previously and everything was working. Note: If you have never had it working, ensure that the name you are using is resolvable in DNS and it’s the name on the certificate of the MRS Proxy server, (or at least a subject alternative name) See this link for how to set it up properly.

Assuming, (like me) everything is OK and the MRS proxy service is running etc, then I found the root cause of my problem by running;

Get-MigrationEndpoint | fl

MRS Error Get-MigrationEndpoint

I saw the problem straight away, it was using ‘cached credentials for an admin user who had changed their password, now all I had to do was work out how to replace the credentials!

Within the the Exchange admin center > Recipients > Migration > {Ellipsis} > ‘Migration Endpoints’.

Exchange Migraiton Endpoint Settings


Migration Endpoint Credentials

Enter the new (correct credentials)  > Save > Save.

Change Migraiton Endpoint Settings

Now retry your ‘batch’ migration.

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Author: PeteLong

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