If you have apparmor installed and enabled, this could be a bug in the apparmor settings or a conflict between the active profile and openconnect. If you disable apparmor does this error disappear?
** Changed in: network-manager-openconnect (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1660180 Title: SIOCSIFMTU: Operation not permitted openconnect stopped working To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager-openconnect/+bug/1660180/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs