Ap.net membership provdier logged out Unexpectedly
<p>i have Ap.net WebApp    Using asp.net membership provider  when i log in to app after period of time server logged me out from app  ,
and the error is </p>

<h2>Server Error in '/' Application.</h2>

<p>The resource cannot be found. 
Description: HTTP 404. The resource you are looking for (or one of its dependencies) could have been removed, had its name changed, or is temporarily unavailable.  Please review the following URL and make sure that it is spelled correctly. </p>

<p>Requested URL: /login.aspx</p>

<hr>

<p>Version Information: Microsoft .NET Framework Version:2.0.50727.3615; ASP.NET Version:2.0.50727.3614 </p>

<p>i test in my development env everything is ok but when i upload to the server error raised.
i checked timeout and everything ralated to time and session but..
  i am using web.config like this for  authorization in my admin folder 
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