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This article aims to provide basic information about ports , like how to find if a port is open or not / how open a port , create a inbound and outbound rules for port .

How can I test if a port is open?

Using the telnet command you can quickly test if a specific port is open on a host in your network.

Telnet is disabled by default. To enable it:

  1. Go to the Control Panel > Programs and Features > Turn Windows features on or off
  2. Check Telnet Server and Telnet Client
  3. Click OK to have the features installed.

Using the telnet command you can quickly test if a specific port is open on a host in your network. To do this:

  1. Open a command prompt window
  2. Type telnet hostname port_number or telnet ip_address port_number

Replace hostname or ip_address with the name or IP address of the machine you wish to connect to, and port_number with the port number you want to test. You will see a blank screen if the connection was successful (indicating that the specified port is open).

Using CMD Command

netstat -aon View Port Use Along with Process Identifiers

netstat -ab View Port Use Along with Process Names

and also using the task manager to find the related process using PID

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