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Wednesday, December 7, 2022

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 .

Satheshwaran Manoharan
Satheshwaran Manoharanhttps://www.azure365pro.com
Specialized in Microsoft Azure - Office 365 / Microsoft Exchange; conducted numerous projects worldwide in designing, supporting, and implementing messaging and virtualization infrastructure for medium-sized and large enterprises. Further, I am a Cloud Architect and Technical Advisor for various start-ups.

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6 COMMENTS

  1. 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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