Devices connected by cable to one of my Flint2 routers (fw 4.8.3) have suddenly lost network access (pinging the router returns a time out message). No configuration changes were made on either the router or the connected devices. I can connect to the Flint2 remotely, via GoodCloud or WireGuard VPN. I don’t use the router’s Wifi interfaces.
Connected devices report the correct LAN addresses and gateway address, arp returns the router's correct MAC address, and the device network interfaces are shown as being up, at 1 Gbps. The Flint 2 GUI shows the devices as online, but no traffic is reported.
- Restarting the router and the network devices has made no difference.
- Trying different LAN ports and network cables has made no difference.
- Disabling Flint2 features (AdGuard, hardware acceleration, etc.) has made no difference.
- Disabling the firewall on the network devices has made no difference.
The System log with AdGuard enabled reports:
user.notice AdGuardHome[20167]: 2026/02/16 18:49:10.890652 [error] dnsproxy: responding request proto=udp err="writing message: write udp [::]:3053->192.168.44.22:64604: sendmsg: required key not available"
The System log without AdGuard enabled reports:
daemon.err dnsmasq[21750]: failed to send packet: No error information
My networking knowledge is limited, and I don't know what else to try. Any help would be very much appreciated.