Internet explorer cannot display the webpage in IIS7

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.NET3.5

.NET

Hi,
In my web application i am using forms authentication and it is working fine in my local machine. After deploying code on IIS7.0, it is working some time and sometimes it is not. When i run the application, it is giving me the login page and after entering the credentials it is displaying as "Internet Explorer Cannot display the web page" after approximately 1 min.
Below are my web.config settings.

<authentication mode="Forms">
      <forms loginUrl="Login.aspx"
      protection="All"
           timeout="30"
           name=".ASPXAUTH"
           path="/"
           requireSSL="false"
           slidingExpiration="true"
           defaultUrl="SDAuditUI.aspx"
           cookieless="UseDeviceProfile"
           enableCrossAppRedirects="false" />
    </authentication>
    <authorization>
      <deny users="?" />
      <allow users="*" />      
    </authorization>    

These are my settting is Appliacation pool in IIS7.0
Managed Pipelinemode: Integragrated
Identity: NetworkService

Please adive where are the settings I am missing in IIS7.0