title: Regular event ID 1315 "ticket supplied was invalid" when not using forms auth
body: <p>We're seeing lots of events like these even though we have authentication set to "None":</p>
  
  <pre><code>Event code: 4005
  Event message: Forms authentication failed for the request. Reason: The ticket supplied was invalid. 
  Event time: 12/3/2013 12:50:06 PM 
  Event time (UTC): 12/3/2013 6:50:06 PM 
  Event ID: 9a0cc0c93a964b1c9bd7126dc367b09b 
  Event sequence: 163807 
  Event occurrence: 23853 
  Event detail code: 50201 
  
  Application information: 
      Application domain: /LM/W3SVC/1/ROOT/BG-4-130305700816025855 
      Trust level: Full 
      Application Virtual Path: /BG 
      Application Path: D:\inetpub\wwwroot\BG\ 
      Machine name: ***
  </code></pre>
  
  <p>I even double-checked in IIS Manager at the site and server level and the GUI shows Forms Authentication set to Disabled.</p>
  
  <p>This is using asp.net 4.0 running on Server 2008 R2.  I tried adding a machineKey to machine.config just to test but it still fails.  It doesn't seem like all requests are failing since I only see the error once a minute but I can't isolate which ones are failing.  I even tried using Fiddler to send a bogus .ASPXAUTH cookie but I didn't see any new errors in the event log that match up with my request.</p>
  
  <p>Anyone have any ideas?</p>
  
  <p>Thanks,
  tim</p>