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This article mainly shows you "how to use the telnet command in Linux to determine whether a port is open", the content is easy to understand, clear, hope to help you solve your doubts, the following let the editor lead you to study and learn "how to use the telnet command in Linux to determine whether a port is open" this article.

How do I use the telnet command to see if a port is open on a remote Linux system?

The telnet command is used to communicate interactively with another host over the TELNET protocol.

The general syntax of the telnet command:

$telnet [HostName or IP] [PortNumber]

If the probe is successful, you will see output similar to the following:

$telnet 192.168.1.9 22Trying 192.168.1.9...Connected to 192.168.1.9.Escape character is'^] '.SSH-2.0 muri OpenSSH _ 5.3 ^] Connection closed by foreign host.

If the probe fails, you will see output similar to the following:

$telnet 192.168.1.9 80Trying 192.168.1.9...telnet: Unable to connect to remote host: Connection refused what is the Linux system Linux is a free to use and freely spread UNIX-like operating system, is a POSIX-based multi-user, multi-tasking, multi-threading and multi-CPU operating system, using Linux can run major Unix tools, applications and network protocols.

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