If a remote system is running the DameWare Mini Remote Control client agent service, Mini Remote Control only uses a single TCP port to connect to it. The default TCP port is 6129; however, you can specify any of the 65,000 valid TCP ports in the Mini Remote Control application properties. Since TCP 6129 is a well known port for the Mini Remote Control program, DameWare recommends you choose a different port to ensure the most secure connections.
If a remote system is not running the Mini Remote Control client agent service, Mini Remote Control attempts to install it over the installed protocols of the remote operating system for File & Printer Sharing.
Microsoft defines File & Printer Sharing as:
UDP 137 (Name)
UDP 138 (Datagram)
TCP 139 (Session)
TCP 445 (Direct Hosting)
If you do not want Mini Remote Control to install the client agent service using these ports, or Mini Remote Control is unable to connect to the remote system using these ports, install the service using another installation method. For additional information, see Client agent service installation methods.