Your NiceLabel application would like to use a specific computer port for TCP communication and you are not sure if the port is open.
You can check ports on your computer or on a computer that you want to connect.
Open Windows PowerShell application.
Enter the syntax:
Test-NetConnection -ComputerName TargetComputer -Port 1234
Where "TargetComputer" stands for your computer name or computer name that you want to connect and "1234" is the port number you want to check.