I can confirm the test steps mentioned above. In an unchanged scenario a formerly failing-to-connect case got working when replacing the qemu (on Focal) in use with a patched one.
Adding an SRU Template for Focal to the bug description ... -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1849644 Title: QEMU VNC websocket proxy requires non-standard 'binary' subprotocol To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1849644/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs