Just created a new Plesk droplet, migrated two WordPress installations, hadn’t touched anything and access to everything (Plesk, websites) became inaccessible overnight (ERR_CONNECTION_TIMED_OUT).
I found that UFW had somehow blocked everything incoming/outgoing, so I disabled it, and everything was accessible, but the next day the same thing began occurring. I checked and UFW is still disabled, I’ve tried restarting all services, and rebooting the server, but nothing.
Any ideas what this could be or where to start looking?
These answers are provided by our Community. If you find them useful, show some love by clicking the heart. If you run into issues leave a comment, or add your own answer to help others.