Enabled the firewall again.

[digimer]

This is fully expected to fail initially.

[ylei-tsubame]

Please test the VNC connection from the web UI.

The VNC-to-websocket translation is done by websockify on a server's VNC port + 10000. For example, a server with VNC port 5900 should have the websockify port (listening to incoming connections) at 15900.

The port selection for the websockify instance will also jump to the next available port when the suggested one is in-use. For example, if ports 15900 and 15901 are in-use, then port 15902 will be selected as the websockify port. We shouldn't need to worry about this because there shouldn't be any known apps using ports in this area.

[digimer]

What command specifically is used to check if a port is in use and needs to be incremented? I can do the same check when opening the corresponding port.

[digimer]

retest this please

[digimer]

This PR now passes automated testing. Manual testing now required before merge.