Port 80 — HTTP

Port 80 — TCP

Web access without TLS encryption.

What is port 80 used for?

Unencrypted web traffic.

Transport protocol

TCP

Security precautions

Redirect to HTTPS when accounts or sensitive data are involved.

Should we open this port in the firewall?

Allow this port only when a required service uses it. Apply least privilege: restrict authorized sources, destinations and interfaces, and log connections where appropriate.

How do I check this port?

Test-NetConnection SERVER -Port 80

On Linux, nc -vz SERVER 80 checks TCP connectivity only. A successful TCP connection does not validate the application, authentication or TLS configuration.

Port-to-service mappings are common conventions. Applications can use a different configured port; confirm the actual service and transport.