Roon core won't connect to ARC

Roon Core Machine

iMac (21.5-inch, Late 2013)
3.1 GHz Quad-Core Intel Core i7
16 GB 1600 MHz DDR3

Networking Gear & Setup Details

Connected by ethernet to Draytek Vigor 2862 router

Connected Audio Devices

All devices (several streamers) connected by ethernet

Number of Tracks in Library

About 10,000 tracks I think

Description of Issue

Have downloaded Roon 2.0 but the port forwarding doesn’t work. I get this error message

{
“connectivity”: {“status”:“NetworkError”,“status_code”:504,“error”:“error: Error: ETIMEDOUT, response code: undefined, body: undefined connected? undefined”},
“external_ip”: {“actual_external_ip”:“87.224.73.211”,“router_external_ip”:null},
“natpmp_autoconfig”: {“status”:“NotFound”},
“upnp_autoconfig”: {“status”:“NotFound”}
}

I have gone into my router’s settings and enabled UpNP but it doesn’t seem to make any difference. Any help appreciated - thanks!

Need more info. Who is your ISP. What other gear is in your network? What’s connected to what?