Session Expired and Crystal report is not showing

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ASP.NET4

Dear All,

I upload my project in Sever 2008R2. It working fine in Server itself. I can see the crystal report everything and some of the client also working fine. But some of client crystal report not showing, sometime session automatically expired.

<identity impersonate="false" />
  <!--<sessionState mode="StateServer" timeout="60"></sessionState>-->
  <sessionState mode="InProc" cookieless="false" timeout="1440"></sessionState>
  <compilation debug="true" strict="false" explicit="true">

Any suggestion

Thanks
Basit.