CWA 2007 R2 Login Fails

Ran into this bug today while trying to deploy Communicator Web Access 2007 R2 on Windows Server 2008. Apparently the SPN isn’t registered properly during the installation process which causes integrated authentication to fail. After you try to sign in you’ll see this error:

Cannot sign in because your computer clock is not set correctly or your account is invalid.(Error code: 0-1-492)


Jason Shave ran across this same issue a few weeks ago and has a nice explanation on how to add the SPN to your CWAService account.

I had to restart the CWA virtual server before the SPN change took effect, but after that CWA logged in just fine:



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Hi there. My name is Tom Pacyk and this is my small home on the web. I love the intersection of design, technology, and communication, which is a combination that led me to a career in sales and marketing roles at places like Zoom and ServiceNow. They're a bit old now, but I also had the opportunity to publish a couple of books along the way.

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