Roon ARC unable to find server despite port forwarding (ref#S2DY1R)

Support
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Removed private information and transitioned back to a public topic.

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Hello @xiaoliu610 ,

I’ve transitioned your post back to a public thread so that the entire support team can weigh in as needed. In the past, Xfinity had a feature called Comcast Constant Guard that caused connectivity issues, do you happen to have this feature turned on in your router?

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I have not modified the settings of Comcast Constant Guard, which should be the default situation of the system. Do you know how to modify it?

At the same time, I have set the DMZ for the Roon Server device, but the Roon Arc still cannot connect. What should I do now?

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I googled Comcast Constant Guard and it seems to be a Windows software? But my Roon Server is installed on NAS, and my phone needs to use Roon Arc to access it. It shouldn’t be related to Comcast Constant Guard, right?

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You should not do this. It opens up a raft of security issues since it forwards any unsolicited external connection attempts (even malicious ones) on any port to your Roon Server device and thus exposes your network to external threats.

You should only forward TCP connection requests on a single port (as configured in Roon → Settings → Roon ARC in the normal Roon client [not ARC] which usually defaults to 55000).

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What I want to express is that I have even set up DMZ, but the Roon Arc app on my phone still cannot find the Roon Server. What should I do now :joy:

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Have you tried uninstalling and reinstalling the ARC app on the phone?

Do this while the phone is on the home wifi so that the initial sync doesn’t have to deal with network complications.

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I have tried:

  1. Uninstalling the app and reinstalling it, unable to search for the Roon Server
  2. Changing phone, unable to search for Roon Server
    Is there any other way?
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Hello @xiaoliu610 ,

Thanks for letting us know. I was looking over your Roon Server diagnostics and it looks like you might be in a country impacted by a Mandated Firewall. We can’t quite control how Roon/ARC would behave in such situations. Router-based VPN solutions have helped other users in similar situations:

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I am in the United States and use Xfinity😂

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Hi @xiaoliu610,

This doesn’t seem to be the case - I’d reccomend what @noris has shared above.

We’re not able to recommend any specific steps in this case. Perhaps you can gain some help from the Tinkering section of community here:

You have our apologies @xiaoliu610

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