IIS application using application pool identity loses primary token?

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Through Microsoft Support I found out that we ran into the issue described in Microsoft Knowledge Base article KB2545850. This only occurs when ApplicationPoolIdentity is used. It occurs very easily, namely, after the machine account password is changed (which by default happens automatically every 30 days), and then IIS is restarted (e.g., through iisreset). Note that the problem goes away after a reboot, according to Microsoft and our observations.

According to Microsoft it is not possible to check if your Windows/IIS has gotten into this state.

Microsoft has a hotfix attached to this KB article. There is no indication when that hotfix will be rolled into an official delivery, and the hotfix is already 10 months old. In our specific case, we decided to switch to NetworkService instead.

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