title: Possible Reasons aspx Crystal Report Viewer would hang indefinately on IIS 7.5, under certain reports?
body: <p>this is a bit of a shot in the dark but I am truly stuck here.</p>
  
  <p>I have an asp.net MVC app that spits out some PDF reports. 
  This works great on production Windows Server 2003 / IIS6, Local Dev Server, and Win 7 / IIS7</p>
  
  <p>When I go to production IIS 7.5 / Server 2008, some reports hang indefinately without an error or a trace written. They just continue to spin seemingly forever, there is never a failed request back from the server.</p>
  
  <p>Some reports do this, some do not, we've had multiple folks look at the reports and can find no discernable differences. </p>
  
  <p>Does anyone have any tips on:
  Why I never get an error/timeout?
  Why some crystal reports would fail, and others are fine? </p>
  
  <p>This works 100% fine in all other environments. I did some SQL tracing and the database commands are being run and terminating pretty much instantly, there is no hang there.</p>
  
  <p>I have the 64 and 32 bit crystal runtime installed on the server. (Allow 32-bit is set to true for the app pool).</p>
  
  <p>I have the same setup elsewhere and it works with no issues on Win 7 / IIS 7.</p>
  
  <p>I've temporarily added the app user to Local Admins, and given him full access to both databases </p>