Port 443 — HTTPS

TCP · Port 443/TCP is used for secure web traffic, enabling HTTPS connections between clients and servers. This port plays a crucial role in encrypting data transmitted over the internet, ensuring confidentiality and integrity of online communications.

Port Number: 443
Service Name: HTTPS
Protocol: TCP
Common Software: Apache, Nginx, IIS, Caddy

Security Notes

Use TLS 1.2+. Disable SSLv2/SSLv3. Renew certificates regularly.

FAQ

What is port 443 used for?

Port 443 is used for HTTPS. Port 443/TCP is used for secure web traffic, enabling HTTPS connections between clients and servers. This port plays a crucial role in encrypting data transmitted over the internet, ensuring confidentiality and integrity of online communications. Common software: Apache, Nginx, IIS, Caddy.

Is port 443 dangerous to leave open?

Use TLS 1.2+. Disable SSLv2/SSLv3. Renew certificates regularly.

How do I check if port 443 is open?

Use nmap: nmap -p 443 <target> or check locally: ss -tlnp | rg 443