About 6 years ago I wrote a set of web applications and web services, and clients for those services, which required client certificates. I wasn't an expert on certificates, but the system was straight forward: I set up a CA, created the certificate for IIS 6, requested the certificates for the XP clients, and it all worked fine for years. I wrote up instructions for requesting client certificates, and for years our support section mangaged this with no problems. When Vista arrived, I couldn't get it to work as a client but was able to tell the customers that they had to stick with XP. When WIndows 7 got popular, I was told I had to make it work.
So now I am now trying to do the same with IIS 7.5 and Windows 7 clients. It all still seems to be straight forward, but the clients (IE9 and .Net4 clients for the web services) always get the HTTP 403.7 error if IIS requires client certificates. All the help I've seen here is for obvious configuration steps. I am trying to fin ...
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