Here is an FAQ on this topic: http://x.cygwin.com/docs/faq/cygwin-x-faq.html#q-xserver-nolisten-tcp-default
Here are the last two announcements in which there were major changes to the xinit package; both of them spelled out the changes very clearly: https://sourceware.org/ml/cygwin-announce/2015-07/msg00013.html https://cygwin.com/ml/cygwin-xfree-announce/2014-11/msg00004.html -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple