Hi Andrew, On Mar 8 23:46, Takashi Yano wrote: > Hi Corinna, > > Thanks for your advice. > > On Fri, 8 Mar 2019 15:11:18 +0100 Corinna Vinschen wrote: > > > In Linux, connect() in the client returns befor the > > > server calls accept(). However, in cygwin, connect() > > > does not return until the server calls accept(). > > > > This is a result of the handshake to exchange credentials for > > getpeereid(). To workaround this issue, try building screen > > with a tweak. Server and as client should call > > > > setsockopt (sock, SOL_SOCKET, SO_PEERCRED, NULL, 0); > > > > before calling accept or connect. > > Following your advice, I tried the patch attached and > confirmed the problem regarding -Q option is solved. any chance to rebuild screen with the patch from https://cygwin.com/ml/cygwin/2019-03/msg00167.html Thanks, Corinna -- Corinna Vinschen Cygwin Maintainer