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Error when Migrating on-prem mailbox to exchange online

khairulf (ICTD) 1 Reputation point
2022-07-07T01:48:52.777+00:00

Data migrated:

Migration rate:

Error: TimeoutErrorTransientException: The call to 'https://exsync.ssm.com.my/EWS/mrsproxy.svc' timed out.

Error details: The request channel timed out attempting to send after 00:00:00. Increase the timeout value passed to the call to Request or increase the SendTimeout value on the Binding. The time allotted to this operation may have been a portion of a longer timeout.

--> The HTTP request to 'https://exsync.ssm.com.my/EWS/mrsproxy.svc' has exceeded the allotted timeout of 00:00:00. The time allotted to this operation may have been a portion of a longer timeout.

--> The request channel timed out attempting to send after 00:00:00. Increase the timeout value passed to the call to Request or increase the SendTimeout value on the Binding. The time allotted to this operation may have been a portion of a longer timeout.

--> The HTTP request to 'https://exsync.ssm.com.my/EWS/mrsproxy.svc' has exceeded the allotted timeout of 00:00:00. The time allotted to this operation may have been a portion of a longer timeout.

Last successful sync date:

Data consistency score:

Please help me to solve this issue..

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Amit Singh 4,956 Reputation points
    2022-07-07T10:27:12.86+00:00

    This issue may happen when the ExchangeGUID of the cloud MailUser doesn't match the ExchangeGUID of the on-premises mailbox.
    Here is a KB about the issue you are encountering https://support.microsoft.com/en-us/help/3065754/the-remote-server-returned-an-error-404-or-http-request-has-exceeded-t. You can reset the cloud ExchangeGUID as suggested in the KB.
    If the issue persists, you can try to filter the synced MailUser out, delete it from Office 365, and then sync it to the cloud again to migrate the on-premises for the test.

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  2. KyleXu-MSFT 26,246 Reputation points
    2022-07-08T07:28:40.193+00:00

    @khairulf (ICTD)

    Are you using Exchange 2010? If so, have a check about "DataImportTimeout" in "C:\Program FIles\Microsoft\Exchange Server\v14\ClientAccess\exchweb\ews"

    If you aren't using Exchange 2010, I would suggest you try to disable MRS proxy and enable it again: 

    Get-WebServicesVirtualDirectory | Set-WebServicesVirtualDirectory -MRSProxyEnabled $false  
Get-WebServicesVirtualDirectory | Set-WebServicesVirtualDirectory -MRSProxyEnabled $true

    If could, I also suggest you try to disable firewall temporarily for check whether this issue caused by firewall configuraton.

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