No external access to Synology NAS works perfect with PLEX

Roon Core Machine

Synology NAS DS1522+

Networking Gear & Setup Details

  1. Who is your internet service provider?
    Vodafone Cable

  2. Please list the make and model of your modem and router?

FRITZ!Box 6660

  1. Do you have any additional network hardware, like additional routers or managed switches?
    No

  2. Does your network have any VPNs, proxy servers, or enterprise-grade security?
    No

Connected Audio Devices

iPhone using Roon works perfect
iPhone using Roon ARC external access not available
Other external acceess e.g. via PLEX works perfect

Description of Issue -

What is the exact port forwarding error message you see in the Roon Settings → ARC tab?

{
“ipv4_connectivity”: {“status”:“NetworkError”,“status_code”:502,“error”:“error: Error: connect ECONNREFUSED 176.hhh.iii.jjj:55002, response code: undefined, body: undefined”},
“ipv6_connectivity”: {“status”:“NetworkError”,“status_code”:504,“error”:“error: Error: ETIMEDOUT, response code: undefined, body: undefined connected? undefined”},
“external_ip”: {“actual_external_ip”:“176.hhh.iii.jjj”,“actual_external_ipv6”:“2a02:aaa:bbb:ccc:ddd:eee:fff:ggg”,“router_external_ip”:“null”},
“status”: “status”: MultipleNatFound
,
“natpmp_autoconfig”: {“status”:“NotFound”},
“upnp_autoconfig”: {“server_ip”:“192.168.178.1”,“found_upnp”:true}
}

This is the issue.

You might get some solutions from this thread

Generally speaking, if you are on a CGNAT connection from Vodaphone (which essentially means you do not have a public facing IP address and so ARC will not work), call them and explain that you are trying to setup port forwarding and it is not working. See if they can help out and maybe provide an IPv4 address.

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