Package: xbase-clients Version: 1:7.0.0-2 After upgrading to Xorg 7, X11 forwarding doesn't work. It's enabled on both server and client, but the other end gives this error: Xlib: connection to "localhost:11.0" refused by server Xlib: Invalid MIT-MAGIC-COOKIE-1 key (screem:27560): Gtk-WARNING **: cannot open display: I tried both ssh -Y and -X, to no avail.