Manually Specify a TCP Port for Host Diagnostics
The toolkit installation process prompts you either use the default TCP port number (21344) or enter a different, available port that Host Diagnostics can use. If you perform a silent installation, the installer automatically chooses an unused TCP port number in range 21344 to 21363. However, if you do not provide a port or the installer cannot locate an unused port, you must manually enter a port number.