title: Using a colon (:) in return URL with Forms Authentication ("The return URL specified for request redirection is invalid")
body: <p>I am getting the error "The return URL specified for request redirection is invalid" when using forms authentication. I found <a href="http://social.msdn.microsoft.com/Forums/en-US/sqlreportingservices/thread/cf27c390-07b1-4a48-b337-130a8e220069" rel="nofollow noreferrer">this thread</a> that says this is a known issue with return URLs that contain colons (mine indeed contains a few).</p>
  
  <p>The workaround in that thread is to catch the error and use a default return URL ... hardly an acceptable solution. I can try to avoid colons in URLS, but that's a bit of a pain.</p>
  
  <p>Is there another alternative?</p>