Check if port 80 is open
On the server, see what is listening:
sudo ss -tulpn | grep ':80 'From another machine, test reachability:
nc -zv your-server.example.com 80Port 80 (TCP) — HTTP
Unencrypted web traffic.
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- Port
80- Protocol
- TCP
- Service
- HTTP
- Internet exposure risk
- Low
Keep open only to redirect to HTTPS (443).