Sunday , November 8 2020

Mailbox Replication Service was unable to connect to the remote server

Office 365 Mailbox Migration Error –

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The migration encountered an error

The Mailbox Replication Service was unable to connect to the remote server using the credentials provided. Please check the credentials and try again. The call to ‘https://outlook.careexchange.in/EWS/mrsproxy.svc’ failed. Error details: The HTTP request is unauthorized with client authentication scheme ‘Negotiate’. The authentication header received from the server was ‘Negotiate,NTLM’. –> The remote server returned an error: (401) Unauthorized.. –> The HTTP request is unauthorized with client authentication scheme ‘Negotiate’. The authentication header received from the server was ‘Negotiate,NTLM’. –> The remote server returned an error: (401) Unauthorized. –> The Mailbox Replication Service was unable to connect to the remote server using the credentials provided. Please check the credentials and try again. The call to ‘https://outlook.careexchange.in/EWS/mrsproxy.svc’ failed. Error details: The HTTP request is unauthorized with client authentication scheme ‘Negotiate’. The authentication header received from the server was ‘Negotiate,NTLM’. –> The remote server returned an error: (401) Unauthorized.. –> The HTTP request is unauthorized with client authentication scheme ‘Negotiate’. The authentication header received from the server was ‘Negotiate,NTLM’. –> The remote server returned an error: (401) Unauthorized. –> The call to ‘https://outlook.careexchange.in/EWS/mrsproxy.svc’ failed. Error details: The HTTP request is unauthorized with client authentication scheme ‘Negotiate’. The authentication header received from the server was ‘Negotiate,NTLM’. –> The remote server returned an error: (401) Unauthorized.. –> The HTTP request is unauthorized with client authentication scheme ‘Negotiate’. The authentication header received from the server was ‘Negotiate,NTLM’. –> The remote server returned an error: (401) Unauthorized.

Solution –

While the mailbox remote move initiates from Office 365-It tries to Connect to the migration endpoint.

Looks like the migration endpoint password in wrong on On-Premises end.

Open Office 365 Exchange Portal – Recipients- Migration – Click on Migration endpoints .

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Update the Migration Endpoint Password – which has access to On-Prem Mailboxes.

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Rerun the migration .

About Satheshwaran Manoharan

Satheshwaran Manoharan is an Microsoft Office Server and Services MVP , Publisher of Azure365pro.com. Specialized in Office365 / Microsoft Exchange / Virtualization , Sathesh is an Messaging Expert supporting/Designing/Deploying many medium size businesses to large enterprises when it comes to Corporate messaging and Virtualization Infrastructure

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5 comments

  1. Thanks! Been working with MS support for 2 weeks and I stumble across this and it was this freaking simple…

  2. My account, the one I used for the endpoint, was locked out. Unlocked it and everything is good.

  3. I appreciate the post, helped me solve a migration issue over the weekend. The migration endpoint was linked to an account that had been disabled. Thanks again!

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