only 500? try to increase the values for those attributes in <httpRuntime> (appRequestQueueLimit) and/or <processModel> (requestQueueLimit) in machine.configare you also doing other operations, like database connection?also seeError Message: HTTP Error 500-13 - Server Too Busy
http://support.microsoft.com/?id=248037
http://support.microsoft.com/?id=248037
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