Besides direct connections, USB Redirector Client can use callback connections to communicate with remote USB servers. Callback connections are initiated from USB server side, thus USB Redirector Client needs to be able to accept incoming TCP connections. See Features - Callback Connection section for more information.
You can enable or disable accepting of incoming callback connections, as well as change the default TCP port number.
1) Select Settings > Preferences... menu item and switch to Network Server tab.
2) To allow USB Redirector Client to accept callback connections, you need to switch on the Accept callback connections from remote USB servers checkbox. Don't forget to click OK to save changes!
3) To change TCP port number which USB Redirector Client uses for incoming connections, just enter a new TCP port number and click OK. USB Redirector Client will start accepting incoming connections on the new TCP port.