Score:0

How to test if firewall is working/troubleshoot it?

cn flag

So I recently moved my media server to a new computer and moved from popOS to Ubuntu 21.10. I have NPM set up on docker as a reverse proxy and have port 80 and 443 forwarded on the router to my server. On my previous install, I had to allow port 80 and 443 on the firewall before I was able to remotely access through the reverse proxy. On Ubuntu though, I installed GUFW and turned it on but I can still access services through the reverse proxy without adding any exception in the firewall. Doesn't really matter for port 80 and 443 since I was going to allow those anyways, but how can I test other ports on the firewall to make sure its actually working? I saw a post on reddit that perhaps docker is modifying the IPtables and overriding the firewall rules, but it didn't do that on popOS so I'm not sure if that is just different behaviour on Ubuntu or if the firewall isn't working at all.

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