Suppose I am using
Remmina to access
vnc4server via this SSH tunnel:
ssh -L 5901:127.0.0.1:5901 user@remoteIp
Then I install
gufw. It has an
on/off switch. As soon as I switch it on there are no rules because I have not created any rules. Why doesn't port 22 immediately get blocked and my Remmina session fail?