Every month or so IIS 7 running on Windows Server 2008 drops our Virtual Directory settings. I've checked the applicationHost.config file and it appears to save properly.
In the event viewer I did find this somewhat mysterious log:
The WinHTTP Web Proxy Auto-Discovery Service service entered the stopped state.
That is preceded by hundreds of logs referring to an server update.
What would cause IIS 7 to drop a virtual directory?