title: WCF Server Application Unavailable - how to run application written in .NET4.0 (IIS6+)
body: <p>I am trying to run simple application (e.g. generated from template by VS.NET 2010) on IIS6.</p>
  
  <p>I changed it to run with .NET 4.0 (its application pool) and checked with regiis (this pool has 4.0). I also changed all possible httpHandlers (svc etc), to run with NET4.0. All possible rights are checked (i think so).</p>
  
  <p>Almost every request results in "Server Application Unavailable" (sometimes it is empty page with -2146232576 (0x80131700) value) and "...Please review this log entry to discover what caused this error to occur." but EventViewer and IIS Log are empty.</p>
  
  <p>Any ideas? Where to find error details?</p>