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outlook-loopback-exemption.md

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Note

Outlook on Windows: If you're running your add-in from localhost and see the error "We're sorry, we couldn't access {your-add-in-name-here}. Make sure you have a network connection. If the problem continues, please try again later.", you may need to enable a loopback exemption.

  1. Close Outlook.

  2. Open the Task Manager and ensure that the msoadfsb.exe process isn't running.

  3. Set the loopback exemption in an elevated prompt.

    • If you're using https://localhost and port 3000 (the default configuration), run the following command.

      call %SystemRoot%\System32\CheckNetIsolation.exe LoopbackExempt -a -n=1_https___localhost_300004ACA5EC-D79A-43EA-AB47-E50E47DD96FC

    • If you're using http://localhost and port 3000, run the following command.

      call %SystemRoot%\System32\CheckNetIsolation.exe LoopbackExempt -a -n=1_http___localhost_300004ACA5EC-D79A-43EA-AB47-E50E47DD96FC

    Note: If you're not using the default port 3000, replace it in the command with your actual port number.

  4. Restart Outlook.