FYI.. this is probably related to SSHD and not ubuntu. This happens on archlinux as well, and may have something to do with DNS lookups that are forwarded through the SSH proxy. Changing "AddressFamily inet" in sshd_config may help, as that prevents the dns from doing ipv6 lookups.
-- 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/262892 Title: Possible bug found in SSHD and tunneling(Based on question number 43605) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/openssh/+bug/262892/+subscriptions -- 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