My application uses the WinInet api. Using the MFC wrapper classes (CHttpConnection, CHttpFile, etc), I am able to connect, send requests, and receive responses without a hitch. Another part of the application (older code) uses InternetAttemptConnect() and InternetOpen(). InternetAttemptConnect() fails with ERROR_GEN_FAILURE, whose description is "A device attached to the system is not functioning". This is an escalated issue in the field, and has only occurred once among thousands of users. I'm stuck...