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How to use Telnet to test open ports?

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TitleHow to use Telnet to test open ports?
When troubleshooting connectivity issues, one item a user should check is whether the necessary application port is open on the server. An easy way to do this without having to install any additional software is using the familiar Telnet command.
You can check if a port is open on a device by issuing the telnet command. If it is open, you will see a blank screen after issuing the command:

telnet [domainname or ip] [port]

  • [domainname or ip] is the domain name or IP address of the server to which you are trying to connect
  • [port] is the port number where the server is listening

If the port is open, you will see a blank screen. This means that the connection is successful. If the port is closed, you will receive a Connect failed message.


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