The port is checked for availability on a computer running Windows thanks to the Microsoft Telnet client. It allows you to set up a TCP connection to a local host through the element of interest to us.
Instruction manual
The port is checked for availability by performing a series of sequential actions. First of all, we call the main Windows menu using the "Start" button. Specify the telnet command in the search bar to perform the operation of starting the client. Click the "Find" button. We call the
context menu of the telnet.exe element by right-clicking. If you need to check the port for availability, run the client with administrator rights. Confirm the selection in the control window that appears by clicking the "Yes" button. We indicate the value of the administrator password in the system request in order to inform about its authority. You can also use an alternative way to start the client.
Command line
Go to the "Start" and specify the value of cmd.exe using the search bar. Click the "Find" button. We call the context menu of the received element using the right mouse button. We launch the tool with administrator rights. We confirm the choice by specifying the password in the system request. Specify
the telnet command using the text field of the command line that appears. Press Enter to confirm the task. At the next stage, the port is checked for availability by entering the value “o” or open 127.0.0.1. To do this, use the opened command interpreter window of the Microsoft Telnet tool. Confirm the action by pressing the Enter key. We are waiting for the completion of cleaning the tool window or a notification about the impossibility of establishing a connection, we use the following commands to determine the required parameters. Code? / H will allow you to get help. Command c will ensure that the active connection is completed. The value u will reset the parameters. The st code displays the current state. The d character displays options. The command o port_number is used to connect. The sen value allows you to send the selected row to the server. The q character terminates the client. The combination combination is necessary to determine the necessary parameters.
additional information
Now let's look at how the UDP port is checked for availability. First of all, it is worth considering the option with software from Apple. This is where special UDP ports are used. They can be closed on the computer with a security system or network settings. To perform the verification, you need to perform several actions. First of all, you need to find out the IP address. We start the program "System Settings". Specify IPv4 in the search bar. Press the Enter key. On the panel that appears, use the "Advanced" button. Open the TCP / IP tab. There you can see the IPv4 address. If you are using the Windows platform, at the command prompt, enter ipconfig. Press the Enter key. Then you can follow the instructions described above. So we figured out how the remote port is checked for availability.