Had the same problem, but adding "-4" to SSHD_OPTIONS didn't solved, maybe because I couldn't properly reinitialize sshd.
Had to reenable IPv6 with sudo sysctl net.ipv6.conf.all.disable_ipv6=0 -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to openssh in ubuntu. https://bugs.launchpad.net/bugs/136947 Title: no longer honors X11 forwarding -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
