@cybersec-ed

SSH (port 22) - This port is used for remote access to the server, so disabling it will prevent unauthorized access.


RDP (port 3389) - This port is used for Remote Desktop Protocol, which allows remote access to the server's desktop. Disabling it will prevent remote users from accessing the server's desktop.

Telnet (port 23) - This port is used for remote access to the server using the Telnet protocol. Disabling it will prevent unauthorized access.

HTTP/HTTPS (ports 80 and 443) - These ports are used for web traffic, so disabling them will prevent web-based access to the server. If the server is not being used as a web server, disable these ports ASAP!