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I have AsyncPostBackTimeout set to a very large value (3600 = 1 hour). This should cause Ajax request in my .net app (Asp.net 3.5) to continue for an hour before expiring. However, for some reason, they are expiring after approximately 5 minutes (the request continues to execute on the server without any issues).

What could be causing this behavior? Is there somewhere else in the server (IIS 7) or client (FireFox 3.6.10) that could be causing this behavior? Any other config value in asp.net that would override the AsyncPostBackTimeout setting?