Hi Corinna, Thanks for all the consideration you have given this WinSock problem. As a suggestion, would it be possible to add an ssh command line option, so the user could explicitly open the listening port in exclusive mode. This would alleviate the problem of trying to second guess when to use SO_EXCLUSIVEADDRUSE and when to use SO_REUSEADDR. For example: ssh -L2001:server.com:23 -o "ExclusivePort yes" server.com Thanks again Jon -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/