title: ASPX and IIS 8.5 - 403 Forbidden Error
body: <p>i wrote a ASPX Webapplication and generally it works great. BUT since a few days i figured out one big annoying problem with the IIS 8.5!
  You can log in and browse through all sites and subsites without any problem. But after a time (about 6 mins) or when i click on the CheckBoxList on the mainsite "Report" - here <a href="http://i.stack.imgur.com/TK3zJ.jpg" rel="nofollow">CheckBoxList Click</a> - i get the Error:</p>
  
  <blockquote>
    <p>"403 Forbidden - you don't have the permission to access the
    /Report.aspx"</p>
  </blockquote>
  
  <p>On the IIS i've tested so many security configurations and nothing worked fine. The Funny thing is - sometimes i have no problem with the Webapp for 1-2 weeks and than it started all again with the 403 Forbidden Error. Meanwhile i haven't changed anything. </p>
  
  <p>Application Pool is everything fine. Folder permissions and Website permissions with the IIS_USR is configured with full access. Timeout is set on 30 mins. 
  I'm sorry i can't give you a link to test what i wrote because of company internal security.</p>
  
  <p>Do you need any other Infos? Code elements? Settings from the IIS? Screenshots?</p>
  
  <p>Hope you know what i'm looking for and thank you for any help!</p>