· None of these are listed. It simply says "TIMEDOUT" or similar.
System or third-party *firewalls *or *antivirus software* can sometimes block RoonServer from reaching ARC.
· Try adding RoonServer and its associated processes to the whitelist of any firewalls or antivirus software you have installed, including the Windows system firewall, if applicable. [You can learn more about firewall exceptions with Roon here.](https://help.roonlabs.com/portal/en/kb/articles/firewall)
Has the status in Roon -> Settings -> ARC changed after adding exceptions in your firewalls and antivirus software for Roon? ARC is still *Not Ready*
Don't give up yet.
· I'm stuck. I'd like to create a post to ask Roon Community for help.
Describe the issue
I cannot connect to Roon Arc - I've tried all of the troubleshooting and manually configured port fowarding but still no good. This is the error diagnostic: { "ipv6_connectivity": {"status":"NetworkError","status_code":504,"error":"error: Error: ETIMEDOUT, response code: undefined, body: undefined connected? undefined"}, "ipv4_connectivity": {"status":"NetworkError","status_code":504,"error":"error: Error: ETIMEDOUT, response code: undefined, body: undefined connected? undefined"}, "external_ip": {"actual_external_ip":"149.hhh.iii.jjj","actual_external_ipv6":"2a09:aaa:bbb:ccc:kkk:lll:mmm:nnn","router_external_ip":"null"}, "natpmp_autoconfig": {"status":"NotFound"}, "upnp_autoconfig": {"status":"NotFound"}, "multinat_autoconfig": {"status":"Failed","error":"Unknown Error code"} }
Describe your network setup
ISP is ZOOOMM Router is Icotera i4882-01 OS is Windows 11
Based on your description, it is possible that your ISP is not providing you with a routable Public IP address, placing you in a CGNAT (Carrier-Grade NAT) configuration. This effectively blocks the port forwarding required for ARC to work.
We recommend the following steps:
Contact your ISP: Ask them to confirm if you are behind CGNAT. If so, request a static public IP address.
Local Test: Can you please confirm if ARC connects successfully when your phone is on the same Wi-Fi networkas your Roon Server? This helps us rule out local firewall or database issues.
Alternative Solution (Tailscale): If your ISP cannot provide a public IP, or if you prefer not to mess with router settings, Roon supports Tailscale (a simple VPN). This often bypasses these network restrictions entirely.
Could you please share the error code when you are in the new state of not being able to connect via cellular data?
When at home, simply disable wifi on your mobile device and attempt to connect. When you hit the failure, head over to your Roon Settings > Roon Arc and let us know what you see.
Contact your ISP here and specifically inquire if they have “dedicated external IP addresses available for port forwarding users.” If they offer this option, they will know what you are asking. This would disable CG-NAT for your account and allow Roon/ARC to auto-configure for cellular use on your phone.
Install Tailscale. This is a third-party software you’d install alongside Windows 11 and also on your phone. It will create a secure proxy-mesh connection between your phone and RoonServer so that ARC can work anywhere you have internet.
Please see here for specific instructions:
Let us know if we can help with whichever option you choose.