KB ID 0001358

Problem

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

error

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

Solution

Note: For Office 365 Environments see below.

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;

[box]Get-MigrationEndpoint | fl[/box]

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’.

Update.

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

Now retry your ‘batch’ migration.

Office 365 Migration Endpoint Error

If you get the same error when attempting to setup a Migration Endpoint in Office 365;

Then simply skip setting up the endpoint, and perform a batch migration, the system will then connect to the MRS proxy service and work.

Related Articles, References, Credits, or External Links

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