Hi @junbiao_jiang,
Thanks for writing in to let us know about this issue. When this happened were you using a VPN on your RoonServer machine?
Yes, I used a VPN……
without using a VPN, the IPv6 connection attempt was refused, and the IPv4 connection attempt timed out
Hi @junbiao_jiang,
This indicates a blockage upstream of RoonServer and at the level of your service provider. Who is your ISP?
If you’ve been relying on a VPN (other than Tailscale) for ARC to work, then it would be more fruitful to post in Tinkering.
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