Please let us know if this has been useful for you in the comments below and we will add more troubleshooting techniques in future.

These commands and techniques are very useful when you are troubleshooting a network. TcpTestSucceeded will give you True if the port is open and false if the port is closed. The TNC command will give you basic information about the network connection like computer name, IP address, Interface through which you are connecting, source IP, whether the ping is successful or not, Ping reply time and finally TcpTestSucceeded. Choose the Install the hardware that I manually select from a list (Advanced) option, and click Next. Select the Add legacy hardware option, then click Next. You can specify the port number using the -port switch at the end of tnc command. If the details of your COM ports are not visible in the Device Manager, open Device Manager and click on Action from the menu bar. You can also put an IP address instead of the host name. Tns is short for Test-NetworkConnection command. It’s handy when you’re swapping USB to serial adapters Here’s a cmd batch version if you prefer: Batch Show all available COM ports. Here are some methods to list all your available COM ports. Tnc -port 80 Checking open port using PowerShell Powershell Show all available Serial COM ports.

Open PowerShell by going to Run –> powershell.

Let’s check whether a remote network port is open and listening or not. Since Microsoft is pushing PowerShell and CMD has become a legacy system, we should be using PowerShell for most of our working.

No com port available