Exchange Hybrid Mailbox Migration MRSProxy Failed

Namless Shelter 201 Reputation points

Dear Friends,

We are having some issues with our hybrid Exchange environment (Online Exchange, On Prem Exchange 2016 and exchange 2010.)

I was planning to migrate some old mailboxes from Server 2016 to the cloud. It failed with "' could not be completed. Everything else, mail flow, SMTP is working fine.

I checked several things on the on prem servers, seems to be all fine. EWS is all on, and Migration Endpoint is still there. MRS proxy servers configured for both on Prem exchange servers.."

The only thing is that Exchange server 2010 was powered off last year (It used to be main mail server before setting up hybrid). We renewed SSL beginning of this year. The old server 2010 has been renewed with the latest SSL wildcard certificate. I noticed on EWS for Exchange 2010 server, MRS proxy enabled with basic authentication ticked.

Would "Expired SSL on old exchange server" be the reason why Migration failed? Is there any way we can troubleshoot this issue?

I tried disabled and enabled MRS Proxy on old server, restarted IIS, still no luck..

Help please.

Microsoft Exchange Online Management
Microsoft Exchange Online Management
Microsoft Exchange Online: A Microsoft email and calendaring hosted service.Management: The act or process of organizing, handling, directing or controlling something.
3,385 questions
Microsoft Exchange Hybrid Management
Microsoft Exchange Hybrid Management
Microsoft Exchange: Microsoft messaging and collaboration software.Hybrid Management: Organizing, handling, directing or controlling hybrid deployments.
1,427 questions
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2 answers

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  1. Amit Singh 3,731 Reputation points
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  2. Dimik 0 Reputation points

    If you run the command Get-WebServicesVirtualDirectory | select auth you’ll find that (most likely) Basic Authentication is set to $FALSE. To set this to $TRUE and thus enable Basic Authentication you can use the following command:

    Get-WebServicesVirtualDirectory | Set-WebServicesVirtualDirectory –BasicAuthentication $TRUE

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