We have a web server running Ubuntu (16.04.3), nginx, mariadb, ISPConfig with Let’s encrypt. The server is running in AWS (Lightsail). We’ve noticed that from time to time, the server stops responsing. It might then be unavailable for a few minutes, before it starts responding again. But we’ve also had to …

Ubuntu VPS Hosting via Ubuntu webserver stop responding – Need helt troubleshooting and fixing.