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Session Timeout in ASP.Net 4.0

Last Modified: 2012-05-11
Hello Everyone!
I have configured SessionTimeout in my ASP.Net application to 60 minutes in Web.Config file using following configuration.
<sessionState mode="InProc" stateConnectionString="tcpip=localhost:42424" sqlConnectionString="data source=;Trusted_Connection=yes" cookieless="false" timeout="60"/>

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I have also set SessionTimeout in IIS to 60 minutes as expained here.

But I am observing very unstable session timeout behaviour, sometimes it occur after 20 minutes and sometimes after 20+ minutes.
Kindly suggest what I am doing wrong?
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