Remote Utilities uses different ports depending on whether a direct connection or Internet-ID connection is being used.
Direct connection ports
In order to access a remote Host through direct (point-to-point) connection you need to allow the inbound TCP port
5650 on the Host PC and the same outbound port on the Viewer PC:
During Host installation the program automatically adds an "allow" rule to your Windows firewall on the Host PC. However, if you use different firewall software, you need to manually allow this port in the firewall settings.
If port 5650 cannot be used for some reason, you can change it to a different value in the Host settings. If you changed the port on the Host side, remember to also update the port in the corresponding connection properties on the Viewer side.
Internet-ID connection ports
When you enable Internet-ID connection type, the program connects through our company-hosted server by default. Remote Utilities uses a single outbound TCP port
5655 to communicate with our public server. If this port is blocked, the program automatically attempts to use outbound TCP port
With a bit of configuration you can replace our public server with a self-hosted RU Server by which to route your Internet-ID connections. This makes your remote support solution completely autonomous and no longer dependent on our company infrastructure.
For information on RU Server ports, see Ports used by RU Server.