Victron energy Color Control GX Manual page 78

Color Control GX Manual
When Remote Console on VRM is enabled, the GX device will open and maintain a connection to any of the servers
pointed to by supporthosts.victronenergy.com. Which currently resolves to multiple IP addresses (84.22.108.49, 84.22.107.120,
3.25.10.245, 13.244.154.199 or 35.165.124.40, depending on where you are), and likely more in the future. The technology used
is SSH, and it will try to connect using port 22, 80 and 443, only one of them needs to work. The reason for it to try all three is that
on most networks at least one of them will be allowed by the local firewall.
Once connected to one of the supporthost servers, that reverse SSH tunnel is waiting to be connected from someone needing
the connection. Which can be your browser, or a Victron engineer since this same technology is used for the Remote Support
functionality; for more information see above.
When using Remote Console on VRM, the browser will connect to either vncrelay.victronenergy.com, or
vncrelay2.victronenergy.com, using websockets on port 443. For more details of used connections by the GX device, see Q15 of
the FAQ [111].
Page 72 VRM Portal