Check if port 443 is open
On the server, see what is listening:
sudo ss -tulpn | grep ':443 'From another machine, test reachability:
nc -zv your-server.example.com 443Port 443 (TCP/UDP) — HTTPS
HTTP over TLS. UDP 443 carries HTTP/3 (QUIC).
🔒 Runs locally — your input never leaves this browser tab
- Port
443- Protocol
- TCP/UDP
- Service
- HTTPS
- Internet exposure risk
- Low
The standard public web port.