We recently upgraded from 12.0 to 12.5. The upgrade was successful and everything is working fine. The only thing that does not work is the upgrade to SP1. SP1 downloads to approximately 75% and then I get the following error message: "An exception occurred UpdatesChecker error. Unable to read data from the transport connection. An existing connection was forcibly closed by the remote host at System.Net.ConnectStream.Read(byte, Int32 offset, Int32 size) at WebGuiInterface.UpdatesChecker.GetResponse(WebRequestState reqState)" All other updates download fine without problems and when 12.0 was installed all Service Packs also downloaded and installed without problems. We are not using a proxy server and our firewall also does not seem to block anything.