Come sbloccare le porte 80 e 443 che sono chiuse su NMAP

[Lilly]

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Port 80/443 not accessible while installing Discourse

Sounds like you’re doing the right stuff. You’re sure that your DNS resolves to your server IP and only there? Oh. I can’t tell at quick glance whether discourse-setup look only at IPv4. You might try running ./discourse-setup --skip-connection-test to skip the test.