Session timeout before its actual time set in web.config file MVC3

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ASP.NET

MVC3

Dear All,

I have developed a web application in MVC3. The session timeout="600" minutes.

<sessionState mode="InProc" timeout="600" />

There is also set form authentication as given:
<pre lang="xml">&lt;authentication mode=&quot;Forms&quot;&gt;
      &lt;forms loginUrl=&quot;~/Account/LogOn&quot; timeout=&quot;600&quot;/&gt;
    &lt;/authentication&gt;</pre>

Now, the problem is session expires before 600 minutes. its expiring with in 15-20 mins only. Kindly suggest.

Thanks,
Zaheer