Network Port: 443
Network Port Reference Guide
Registered Service Name
HTTPS (Secure Web Traffic)
Transport Protocol
TCP
Functional Overview
Port 443 is the industry standard for HTTP traffic encrypted using Secure Sockets Layer (SSL) or Transport Layer Security (TLS).
Security Risks & Vulnerabilities
Secure, but servers must maintain TLS cipher suites, deprecate legacy protocols (TLS 1.0, 1.1), and enforce HSTS flags to prevent downgrade attacks.
How to audit network port status
1. Scan Open Ports: Use our Port Scanner utility to verify if this port is actively listening on your host.
2. Verify Encryption: Audit the service layer to confirm SSL/TLS is protecting transmission payload.
3. Hardening Rules: Apply the firewall instructions below to shut down unauthorized inbound ports.
UFW Firewall Rules
Allow Command
sudo ufw allow 443/tcp
Block Command
sudo ufw deny 443/tcp
iptables Firewall Rules
Allow Command
sudo iptables -A INPUT -p tcp --dport 443 -j ACCEPT
Block Command
sudo iptables -A INPUT -p tcp --dport 443 -j DROP