MRS Proxy Connection Failed – Exchange Online


MRS Proxy Connection Failed – Exchange Online

After installing new Exchange Servers and you try and start a new migration batch to Exchange Online you receive the following Error.

“MRS Proxy Error ‘The connection to the server could not be completed”

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To resolve the issue, let’s look at if MRS Proxy is enabled on the new Servers.

Get-WebServicesVirtualDirectory|fl ExternalAuthenticationMethods,Externalurl,MRSproxyEnabled,Server

As you can see the new servers does not have MRS Proxy Enabled.

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To enabled MRS Proxy, run the following Exchange Management Shell

Set-WebServicesVirtualDirectory -Identity “exc05\EWS (Default Web Site)” -MRSProxyEnabled $true

After enabling the MRS proxy, restart the Exchange WebApp service pool

Restart-WebAppPool MSExchangeServicesAppPool

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