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”

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.

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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