I worked fine on a remote server (ubuntu-16.04), and when I ran the command from https://github.com/ubuntu/microk8s/issues/408 to fix a bridging problem in microk8s (kubernetes)
I fell into a bigger problem and which isn't my domain either. I lost the connection to the server and I am no longer able to reconnect.
I suspect the following command:
sudo firewall-cmd --zone=trusted --add-masquerade --permanent
I don't know what the command did, I would just like to go back to the state before the execution of this damn command.