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Checking the port if open or not

Posted by Rishikesh Vispute Categories: How to

Checking the port if open or not [ telnet, nmap ]

telnet

TELNET (TELecommunication NETwork) is a network protocol used on the Internet. TELNET is a client-server protocol, based on a reliable connection-oriented transport. This command will help us to find if a particular port on the server is open or not.

Example:

root@server [~]$ telnet google.com 80

Trying 64.233.187.99…

Connected to google.com (64.233.187.99)

From the above example you could find that port 80 is open on google server. If we receive a ” connection refused ” signal, that mean’s the particular port is not open on the server.


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