No connection ARC to Core

I’m getting this error:

{“connectivity”: {“status”:“NetworkError”,“status_code”:502,“error”:“error: Error: connect ECONNREFUSED 84.123.162.183:55000, response code: undefined, body: undefined”},
“external_ip”: {“actual_external_ip”:“84.xxx.162.183”,“router_external_ip”:null},
“natpmp_autoconfig”: {“status”:“NotFound”},
“upnp_autoconfig”: {“status”:“NotFound”}
}

I have manually Port forward, by entering the static IP of the core and using port 55000 for both the private and public LAN/WAN which is the same as the Core IP.

I don’t understand this error message and therefore don’t know how to correct the problem

The ROCK is connected directly to the router with Ethernet cable.

I have put xxx in the external address for safety as this is a public forum.