請問ROON ARC無法連接

我的ARC ROON無法連接，請問各位高手應如何解決，訊息如下:
{
"ipv4_connectivity": {"status":"NetworkError","status_code":502,"error":"error: Error: connect ECONNREFUSED 1.aaa.bbb.ccc:55002, response code: undefined, body: undefined"},
"external_ip": {"actual_external_ip":"1.aaa.bbb.ccc","actual_external_ipv6":"null","router_external_ip":"null"},
"natpmp_autoconfig": {"status":"NotFound"},
"upnp_autoconfig": {"status":"NotFound"}
}