Outlook Anywhere can’t connect to exchange 2010, RPC/HTTP Test with error WinHttpSendRequest failed with error 12002

This morning I had an issue with Outlook Anywhere. I couldn’t connect my outlook to an exchange 2010 server. Via the website https://www.testexchangeconnectivity.com/ i checked if the Outlook Anywhere settings were correct. unfortunately it wasn’t I got the following error. “WinHttpSendRequest failed with error 12002.”

How to solve this issue. First I checked in IIS7 if the SSL settings were correct of the /RPC virtual directory

  • Require SSL (Checked)
  • Require 128-bit SSL (Unchecked)
  • Client certificates: Ignore

Open the IIS log, check the sub status code after 500 HTTP 500.x — Internal Server Error Codes The RPC proxy component has been corrupted on the CAS server, you should re-install it and test the URL again:

Below the steps you have to follow to resolve the issue.

  1. Disable outlook anywhere via EMC
  2. Remove RPC proxy component via PowerShell
  3. Command: servermanagercmd -r rpc-over-http-proxy
  4. Reboot the server
  5. Install RPC proxy component via PowerShell
  6. Command: servermanagercmd -i rpc-over-http-proxy
  7. Enable outlook anywhere
  8. Restart Microsoft active directory Topology service
  9. Check the issue again Now you have to wait for a few minutes.

After a while you can check if you could connect with outlook anywhere to the server.

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