Client certificate mapping in IIS 7 and impersonation

Recently, when migrating an application that uses client certificate authentication to IIS 7, we noticed that ASP.NET impersonation stopped working. Client was authenticated properly, but connection to database server was being established with machine account (DOMAIN\SERVERNAME$). We didn’t find any issue in the configuration, so we raised the case with Microsoft support. It turns out …

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Unexpected IIS stop

We had a weird case some time ago on one of our Windows 2003 server. After we made changes to IIS configuration, more specifically – one virtual folder – the whole IIS stopped. This of course caused outage for some applications, some were switched over to secondary server by load balancer. User making the change …

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