>I have a message in the Event Viewer "Windows Logs\Application" like this:
>
>"Certificate for local system with Thumprint ... is about to expire or already expired"
>
>It is unclear if this is a certificate message reference against the IIS certificate, a licensing on an utility or any other kind of certificate.
>
>I have verified the expiration date on the IIS certificate and this is good until 2017.
>
>How one would proceed to find the origin of this message?

Maybe: http://blogs.technet.com/b/heyscriptingguy/archive/2013/03/05/use-powershell-to-find-certificates-that-are-about-to-expire.aspx

Lots of other variations if you google 'find expiring certificates'