ISAPI Applications that Refuse to Run - Revisited

In my last post on this topic, I stated that it appeared as though IIS was not switching to the internet guest account properly. After much aggravation we finally discovered that the problem had nothing to do with the internet guest account’s permissions. The actual problem was a faulty printer driver, believe it or not. One of the printer drivers had a memory leak that eventually caused the kernel non-paged pool to become exhausted. Once that happens, IIS stops processing web requests. We downloaded and installed the latest versions of all of the printer drivers and the problem seems to be gone. Fingers crossed.

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