How to fix connection timeout problem with MongoDB

Some of us have encountered a problem problem right after installing MongoDB, turns out we can’t connect. I personally get this: root@ghost:~# mongo MongoDB shell version v4.2.8 connecting to: mongodb://127.0.0.1:27017/?compressors=disabled&gssapiServiceName=mongodb 2020-10-30T12:10:51.955+0100 E QUERY [js] Error: couldn’t connect to server 127.0.0.1:27017, connection attempt fa iled: SocketException: Error connecting to 127.0.0.1:27017 :: caused by :: Connection timed out : connect@src/mongo/shell/mongo.js:341:17 @(connect):2:6 2020-10-30T12:10:51.958+0100 …