Communicator Web Access Integrated Authentication

This morning I set about adding a Communicator Web Access (CWA) server to my lab and had a small issue with the integrated Windows authentication piece. Basically, I'd click the sign in button and get a Windows authentication dialog instead of being signed into CWA. Even with valid credentials my login would fail and I'd see an error "Cannot sign in. The password or sign-in address may be incorrect. Make sure that your sign-address matches your user account and try again."


Turns out there a few steps you need to take to make this work:

  1. Open Internet Explorer.
  2. Click Tools | Options.
  3. Click the Security tab.
  4. Click on Local intranet and press the Sites button.
  5. Uncheck the box Automatically detect intranet network and press the Advanced button.
  6. Type in the URL for your CWA website, in my case it was and press Add, Close and then OK.
  7. Click the Custom level button.
  8. Scroll all the way to the bottom and ensure Automatic logon only in Intranet zone is selected and press OK and OK.
  9. Refresh the page, click Sign in once more and you should log in no problem.