Quick session timeout problem in ASP.NET 4.5.1 frame work

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ASP.NET

below is the code that I have used for the web config file and Global.asx file code, my session gets timeout very quickly it not working properly.
I have used a dedicated server for hosting my web application. Plz help

What I have tried:

// Web Config setting


<compilation debug="false" targetframework="4.5.2">
<assemblies>
<add assembly="System.Data.Linq, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089">


<authentication mode="Forms">
<forms loginurl="#" protection="All" timeout="60" requiressl="false" slidingexpiration="true" cookieless="UseDeviceProfile" enablecrossappredirects="false">

<sessionstate timeout="60" mode="InProc" cookieless="false" stateconnectionstring="tcpip=103.93.16.21" statenetworktimeout="60" sqlconnectionstring="data source=103.93.16.21;Integrated Security=SSPI">
<httpruntime executiontimeout="3600" maxrequestlength="1048576" requestpathinvalidcharacters="" requestvalidationmode="2.0">
<pages buffer="true" validaterequest="false" enableeventvalidation="false" viewstateencryptionmode="Never" enableviewstatemac="false" maintainscrollpositiononpostback="true" controlrenderingcompatibilityversion="3.5" clientidmode="AutoID">





// Global.asax File code for session

void Session_Start(object sender, EventArgs e)
{
// Code that runs when a new session is started
//Session.Timeout = 60;

if (Session.IsNewSession)
{
//do things that need to happen
//when a new session starts.
Session.Timeout = 60;

}
}