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Testing a Network Port Connection

October 10, 2018

You can test a network port connection using the “nc” command on Linux and “telnet” on Windows.

Format:
$ nc -zv domain.com port
C:\> telnet domain.com port

$ nc -zv domain.com 80
Connection to domain.com 80 port [tcp/http] succeeded!

$ nc -zv domain.com 80 Connection to domain.com 80 port [tcp/http] succeeded!

C:\> telnet -zv domain.com 80
Connecting To domain.com...Could not open connection to the host, on port 80: Connect failed

C:\> telnet -zv domain.com 80 Connecting To domain.com...Could not open connection to the host, on port 80: Connect failed

For Telnet, if a connection is successful, it returns no message.

Filed Under: Cloud, Linux Tagged With: connection, nc, port, telnet, test

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