ROON ARC connection issue (cannot connect, error status_code 502)

Roon Server Machine

ROCK, Lenovo Thinkpad X260, Intel I7
Connect with cable ethernet

Networking Gear & Setup Details

Software router operating with Openwrt,
connected with fiber modem(set bridge mode), get public IP address by PPPOE through software router;
router connect with a 8ports switch, ROCK and ROON bridge connected with it
At Openwrt, I have set port forwarding,
I use only IPV4, prohibit any IPV6;
My internal ethernet IP is: 10.10.10.**;
For example, ROCK IP is: 10.10.10.184;
ROON bridge IP is: 10.10.10.164;
2 months ago, the ARC worked fine;
Recently it cannot work and report the error as below, I have not change any setting;

  1. Who is your internet service provider?
    ISP is China Telecom

  2. Please list the make and model of your modem and router?
    Modem is ZTE brand, router is X86 intel 3865 CPU runnning with Openwrt

  3. Do you have any additional network hardware, like additional routers or managed switches?
    NO

  4. Does your network have any VPNs, proxy servers, or enterprise-grade security?
    Yes, I have set V2Ray on my S/W router

Connected Audio Devices

Roon bridge made by Rasberry Pi 4, using I2S interport

Description of Issue -

At ROON remote test page, it report:
{
“ipv4_connectivity”: {“status”:“NetworkError”,“status_code”:502,“error”:“error: Error: connect ECONNREFUSED 192.9.162.40:12305, response code: undefined, body: undefined”},
“external_ip”: {“actual_external_ip”:“192.9.162.40”,“actual_external_ipv6”:“null”,“router_external_ip”:“null”},
“natpmp_autoconfig”: {“status”:“NotFound”},
“upnp_autoconfig”: {“status”:“NotFound”}
}

Hi @li_zhi,

China Telecom users will require additional steps to bypass firewall restrictions. This is outside of Roon’s control, unfortunately. If you’ve been using a VPN with Roon, please post in Tinkering to consult the expertise of other users in a similar situation.