IIS7 app pool by default only can only have 1.5 minutes window for a non-responsive application. During IIS web application or website debugging time, we may want to change its corresponding application Pool advanced setting’s “Ping Maximum Response
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Read the complete post at http://blogs.iis.net/webdevelopertips/archive/2009/03/30/tip-48-did-you-know-that-iis7-application-pool-s-ping-settings-may-affect-iis7-based-website-or-application-debugging.aspx