I figured it out, it only happens when firefox is running on the local machine, I will post the requested information next.
** Changed in: openssh (Ubuntu) Status: Invalid => New -- [hardy] Cannot xforward firefox https://bugs.launchpad.net/bugs/214829 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to openssh in ubuntu. -- 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