automatically session out in asp.net

Question

on local server its working good but on hosting server in firfox working good but in chrome automatically session out within 1 minute i applied the code in web config see my web config 

 

 

 

 

 

<?xml version="1.0"?>

<configuration>

<system.web>

<customErrors mode="Off"/>

<compilation debug="true" targetFramework="4.0">

<assemblies>

<add assembly="System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>

<add assembly="System.Web.Extensions.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>

<add assembly="System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>

</assemblies>

</compilation>

<httpRuntime executionTimeout="3600" maxRequestLength="10192" />

<machineKey validationKey="1234567890123456789012345678901234567890AAAAAAAAAA"

decryptionKey="123456789012345678901234567890123456789012345678"

validation="SHA1" decryption="Auto" />

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

</system.web>

</configuration>