Adguard stopped working

[joncage]

I've just swapped ISP from BT to Airband and have had some issues trying to get their PPPoE settings to work reliably (specifically, DNS lookups appeared to be failing.

So I figured maybe something is up with Adguard (although turning it off / on didn't appear to affect anything).

Then I thought maybe it's because I had home assistant set up to use IPv6 and it looks like Airband doesn't yet support that so I figured I'd check my Adguard settings.

I'm not 100% sure if it's something I did or simply reloading adguard triggered this but now Adguard refuses to start:

2026/01/20 22:47:57.805410 [info] dnsforward: starting reconfiguring server
2026/01/20 22:47:57.805434 [info] dnsproxy: stopping server
2026/01/20 22:47:57.805442 [info] dnsproxy: warning: dns proxy server is not started
2026/01/20 22:47:57.905762 [info] dnsproxy: upstream mode is set mode=parallel
2026/01/20 22:47:57.905783 [info] dnsproxy: cache enabled size=4096
2026/01/20 22:47:57.905798 [info] dnsproxy: max goroutines is set count=300
2026/01/20 22:47:57.905859 [info] dnsproxy: ratelimit is enabled rps=20 ipv4_subnet_mask_len=24 ipv6_subnet_mask_len=56
2026/01/20 22:47:57.905869 [info] dnsproxy: server will refuse requests of type any
2026/01/20 22:47:57.905878 [info] dnsproxy: upstream mode is set mode=parallel
2026/01/20 22:47:57.905885 [info] dnsproxy: cache disabled
2026/01/20 22:47:57.905894 [info] dnsproxy: max goroutines is set count=300
2026/01/20 22:47:57.905959 [info] addrproc: finished processing addresses
2026/01/20 22:47:57.906273 [info] dnsproxy: starting dns proxy server
2026/01/20 22:47:57.906290 [info] dnsproxy: creating udp server socket addr=192.168.1.5:53
2026/01/20 22:47:57.906377 [info] addrproc: processing addresses
2026/01/20 22:47:57.906400 [info] dnsproxy: listening to udp addr=192.168.1.5:53
2026/01/20 22:47:57.906457 [info] dnsproxy: creating udp server socket addr=[2a00:23c7:ca87:4801:ffed:fb03:da61:b63d]:53
2026/01/20 22:47:57.906544 [info] dnsproxy: warning: binding attempt=1 err="listen udp [2a00:23c7:ca87:4801:ffed:fb03:da61:b63d]:53: bind: cannot assign requested address"
2026/01/20 22:47:57.906580 [info] dnsforward: finished reconfiguring server
2026/01/20 22:47:57.906604 [info] dnsforward: warning: http error host=homeassistant.local:8123 method=POST raddr=127.0.0.1:49112 request_uri=/control/dns_config status=500 err="could not reconfigure the server: configuring listeners: listening on udp addr [2a00:23c7:ca87:4801:ffed:fb03:da61:b63d]:53: listening to udp socket: listen udp [2a00:23c7:ca87:4801:ffed:fb03:da61:b63d]:53: bind: cannot assign requested address"

Annoyingly I can't even get it to load enough to change settings in case it's something I screwed up but it looks suspicious to me that it's mentioning an IPv6 address.

What can I do to recover Adguard / what might be wrong?

[joncage]

Rebooting the whole of home assistant appears to have resolved the issue. Weird!