IIS: 443 Port Is Not Responding

The problem

A certificate can be installed correctly while the site remains unreachable because the network path to 443 is blocked.

Recommended approach

Trace the path from public DNS to router/NAT/firewall and finally the IIS binding.

Step-by-step checklist

1. Confirm the public IP.
2. Check router/firewall NAT.
3. Verify TCP 443 is allowed.
4. Confirm IIS has the binding.
5. Test locally and externally.