The diagnostics you’ve provided suggest that your Core is having difficulty reaching Roon servers. There are several independent factors that can cause this error, so we recommend double-checking the following to initiate troubleshooting:
Is your router firmware up to date?
Do you have any VPNs, proxy servers, or enterprise-grade security on this network?
Are you experiencing any issues with Roon Remotes, or other apps on your local network?
If you continue to experience difficulties, please tag the support team and include the following information:
What is the make and model of your modem and router?
Do you have any additional network hardware, like additional routers or managed switches?
Who is your internet service provider and what is your geographic region?
Is your Modem configured in Bridge Mode so that it operates only as a modem or do you have the ports forwarded on both?
Do you have any VPNs, proxy servers, or enterprise-grade security on this network?
No, while using Roon ARC
Are you experiencing any issues with Roon Remotes, or other apps on your local network?
No issues, while under the local network, I could use Mobile Roon ARC(Android).
What is the make and model of your modem and router?
Modem: China Mobile H3-2s
Router: Asus AX88U, Merlin fireware.
Do you have any additional network hardware, like additional routers or managed switches?
No.
Who is your internet service provider and what is your geographic region?
China Mobile,
Liaoning Province, China
Is your Modem configured in Bridge Mode so that it operates only as a modem or do you have the ports forwarded on both?
Not in Bridge Mode.
The modem does the PPPoE, and the Router does the rest.
Thanks for the details, i will try on my devices. But I did hear that the first thing is to obtain the real Public IP, otherwise it will be just as you said, all the rest settings won’t work.