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Are you running docker?

UFW is a popular iptables front end on Ubuntu that makes it easy to manage firewall rules. But when Docker is installed, Docker bypass the UFW rules and the published ports can be accessed from outside.

https://github.com/chaifeng/ufw-docker

The Map Men explain it better than I could:

How do you start a new country? https://youtu.be/hX4s1ZLW_PI

There are NOT 195 countries https://youtu.be/3nB688xBYdY

And just for fun…

The mystery of the squarest country https://youtu.be/8mrNEVUuZdk

(Yes, I’m a big fan!)

Thank you, voted!