DNS issue on HA (if I'm right) but Why

Configuration
21

Rhhhhaaaaaa fuck :crazy_face: :crazy_face:

I didn’t think that
I change my own DNS by Google DNS

Like that HA can resolv FQDN for external sources.
But now my HA can’t resolv my internal device
Example with a camera
image

22

Screw-it! I reinstalled HA and restored from backup to 2024.8.2 trying updated core to 12.15 but waiting 30 minutes and nothing is happening… maybe its for better, because all my services are working fine now.

EDIT: now on 12.15 will all updates in, and DNS working perfectly… all services up.

1 Like
23

I hope that will be ok for you
On my side, I tried reboot and reboot during one day. And after the 6th, the problem come back. But ok I didn’t reinstall HA.

24

Hello!

I had the same problem as the OP.
In my case, my old DNS server (win2kxx) did not support the DNS COOKIE, so any query using the latest dig would return an error…

image

The “recursion requested but not available” warning is the DNS COOKIE giveaway…

Same dig query with +nocookie works.

I ended up switching to a dns server that supports DNS COOKIE, but it would be nice if HA would add the +nocookie option to the checkdns.

John

1 Like
25

I think I’m seeing something like this with my install too. Twice in the last 3 days I’ve seen that some local network services cannot be accessed by HA, such as Unifi Protect and Unifi Network. Xiaomi component can no longer connect to local network devices, even though these are all still accessible via their local app and IP address etc. Supervisor logs has some odd errors similar to what is seen here. And finally, I can see the CPU usage of home assistant go from 3% to approx 20%, probably due to repeated failures for requests.

I can still connect to home assistant locally and remotely, and MQTT still seems to work OK (zigbee2mqtt, tasmota etc), but local network devices connected to home assistant are unreachable (eg wled devices).

A restart of how assistant has resolved the issue for me the 2 times it has occurred.

1 Like
26

Thanks for this answer John :+1:

27

Do you use DHCP or static IP for your Home Assistant installation? What DNS Server(s) are you using? If you use DHCP, you can see what Home Assistant got assinged with by checking ha network info in the Web Terminal.

Not that when you enter multiple, DNS requests are sent at random to one of the specificed ones. This can be problematic if you use internal hostnames.