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You could attach a kernel debugger to the OS. That way you should be able to inspect the state of the OS and your process even if the OS is completely unresponsive. (Unfortunately, it's a lot harder than just hitting "break" in VS. I suggest reading John Robbin's "Debugging Applications for .NET and Windows" before trying that.) You could also try to create memory dumps of your application in regular intervals. You might have to do a little scripting for that, though. (usually, you'd create a dump with a keystroke, using a tool like userdump or adplus, but if the OS is not responding to keystrokes, that won't work.) That way, you know what state your process is in during or shortly before a hang. This page: <a href="http://blogs.msdn.com/debuggingtoolbox/default.aspx" rel="nofollow noreferrer">http://blogs.msdn.com/debuggingtoolbox/default.aspx</a> is a good starting point for scripting WinDbg. (If you don't know what to do with a memory dump, I'd again suggest John Robbin's excellent book on debugging!) Other than that, I can only think of standard debugging tricks: does the problem occur on every PC? Does it happen if there are no client requests? Does it happen sooner if there are more client requests? Does it happen sooner if there is less available physical memory? Try removing parts of your application (maybe on a separate server for testing) and see if the problem still occurs, and so on. Try running it in a VM so you can see if it uses the CPU, harddisk, or network during those "hangs".
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