On 12 September 2018 at 16:13, Solene Rapenne <sol...@perso.pw> wrote: [...] > I think you are supposed to use ssh -XY when using a remote X11 app.
Nope, both -X and -Y enable ForwardX11, but -Y also enables ForwardX11Trusted. Unfortunately I don't see anything in the OpenSSH 7.7->7.8 changelog (https://www.openssh.com/txt/release-7.8) that would explain the observed change in behaviour. $ egrep -C2 "'(X|Y)'" ssh.c options.forward_x11 = 0; break; case 'X': options.forward_x11 = 1; break; -- config_test = 1; break; case 'Y': options.forward_x11 = 1; options.forward_x11_trusted = 1; -- Darren Tucker (dtucker at dtucker.net) GPG key 11EAA6FA / A86E 3E07 5B19 5880 E860 37F4 9357 ECEF 11EA A6FA (new) Good judgement comes with experience. Unfortunately, the experience usually comes from bad judgement.