DNS not resolving with lastest version

[vipial1]

Since my HA updated the dns plugin to version 2022.04.1, most of integrations (that require Internet) are failing due to names not being resolved.

As example, HomeConnect integration logs:

Logger: homeassistant.config_entries
Source: helpers/config_entry_oauth2_flow.py:197
First occurred: 6:21:08 PM (1 occurrences)
Last logged: 6:21:08 PM

Error setting up entry Home Connect for home_connect
Traceback (most recent call last):
  File "/usr/local/lib/python3.9/site-packages/aiohttp/connector.py", line 1154, in _create_direct_connection
    hosts = await asyncio.shield(host_resolved)
  File "/usr/local/lib/python3.9/site-packages/aiohttp/connector.py", line 880, in _resolve_host
    addrs = await self._resolver.resolve(host, port, family=self._family)
  File "/usr/local/lib/python3.9/site-packages/aiohttp/resolver.py", line 33, in resolve
    infos = await self._loop.getaddrinfo(
  File "/usr/local/lib/python3.9/asyncio/base_events.py", line 861, in getaddrinfo
    return await self.run_in_executor(
  File "/usr/local/lib/python3.9/concurrent/futures/thread.py", line 58, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/usr/local/lib/python3.9/socket.py", line 954, in getaddrinfo
    for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
socket.gaierror: [Errno -2] Name does not resolve

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/config_entries.py", line 339, in async_setup
    result = await component.async_setup_entry(hass, self)
  File "/usr/src/homeassistant/homeassistant/components/home_connect/__init__.py", line 83, in async_setup_entry
    await update_all_devices(hass, entry)
  File "/usr/src/homeassistant/homeassistant/components/home_connect/__init__.py", line 105, in update_all_devices
    await hass.async_add_executor_job(hc_api.get_devices)
  File "/usr/local/lib/python3.9/concurrent/futures/thread.py", line 58, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/usr/src/homeassistant/homeassistant/components/home_connect/api.py", line 70, in get_devices
    appl = self.get_appliances()
  File "/usr/local/lib/python3.9/site-packages/homeconnect/api.py", line 136, in get_appliances
    data = self.get(ENDPOINT_APPLIANCES)
  File "/usr/local/lib/python3.9/site-packages/homeconnect/api.py", line 83, in get
    res = self.request("get", endpoint)
  File "/usr/local/lib/python3.9/site-packages/homeconnect/api.py", line 77, in request
    self._oauth.token = self.refresh_tokens()
  File "/usr/src/homeassistant/homeassistant/components/home_connect/api.py", line 62, in refresh_tokens
    run_coroutine_threadsafe(
  File "/usr/local/lib/python3.9/concurrent/futures/_base.py", line 446, in result
    return self.__get_result()
  File "/usr/local/lib/python3.9/concurrent/futures/_base.py", line 391, in __get_result
    raise self._exception
  File "/usr/src/homeassistant/homeassistant/helpers/config_entry_oauth2_flow.py", line 472, in async_ensure_token_valid
    new_token = await self.implementation.async_refresh_token(self.token)
  File "/usr/src/homeassistant/homeassistant/helpers/config_entry_oauth2_flow.py", line 89, in async_refresh_token
    new_token = await self._async_refresh_token(token)
  File "/usr/src/homeassistant/homeassistant/helpers/config_entry_oauth2_flow.py", line 179, in _async_refresh_token
    new_token = await self._token_request(
  File "/usr/src/homeassistant/homeassistant/helpers/config_entry_oauth2_flow.py", line 197, in _token_request
    resp = await session.post(self.token_url, data=data)
  File "/usr/local/lib/python3.9/site-packages/aiohttp/client.py", line 535, in _request
    conn = await self._connector.connect(
  File "/usr/local/lib/python3.9/site-packages/aiohttp/connector.py", line 542, in connect
    proto = await self._create_connection(req, traces, timeout)
  File "/usr/local/lib/python3.9/site-packages/aiohttp/connector.py", line 907, in _create_connection
    _, proto = await self._create_direct_connection(req, traces, timeout)
  File "/usr/local/lib/python3.9/site-packages/aiohttp/connector.py", line 1166, in _create_direct_connection
    raise ClientConnectorError(req.connection_key, exc) from exc
aiohttp.client_exceptions.ClientConnectorError: Cannot connect to host api.home-connect.com:443 ssl:default [Name does not resolve]

The issue is resolved simply by downgrading to previous version:
ha dns downgrade --version 2022.2.0

But after a few hours, HA detects that there is a new version available, it is upgraded to 2022.04.1 and then it starts to fail again.

This is my current dns config (everything is standard):

➜  ~ ha dns info   
fallback: false
host: 172.30.32.3
llmnr: true
locals:
- dns://8.8.8.8
- dns://1.1.1.1
mdns: true
servers: []
update_available: true
version: 2022.02.0
version_latest: 2022.04.1

DNS logs doesn't show anything prompting the error.

The only strange thing that I can observe, is that when DNS are not resolved, nslookup shows strange characters in the response, like a bad encoding (I don't have any example right now, since it is working fine now, will fail again in a few hours).

[Paktosan]

I had the same issue today.
Found it suspicious that the servers list is empty.
The workaround for me was to run ha dns options --servers dns://9.9.9.9 (replace with your DNS provider of choice).
Now there is an entry in the servers list and resolving works again.