Cannot connect to socket even when lxc list works

[AceSlash]

On a server where lxd works correctly (lot of running containers), I have the following error when I try to use pylxd, even after a full system reboot:

# python3
Python 3.6.9 (default, Jul 17 2020, 12:50:27)
[GCC 8.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from pylxd import Client
>>> client = Client()
Traceback (most recent call last):
  File "/usr/local/lib/python3.6/dist-packages/urllib3/connectionpool.py", line 677, in urlopen
    chunked=chunked,
  File "/usr/local/lib/python3.6/dist-packages/urllib3/connectionpool.py", line 392, in _make_request
    conn.request(method, url, **httplib_request_kw)
  File "/usr/lib/python3.6/http/client.py", line 1264, in request
    self._send_request(method, url, body, headers, encode_chunked)
  File "/usr/lib/python3.6/http/client.py", line 1310, in _send_request
    self.endheaders(body, encode_chunked=encode_chunked)
  File "/usr/lib/python3.6/http/client.py", line 1259, in endheaders
    self._send_output(message_body, encode_chunked=encode_chunked)
  File "/usr/lib/python3.6/http/client.py", line 1038, in _send_output
    self.send(msg)
  File "/usr/lib/python3.6/http/client.py", line 976, in send
    self.connect()
  File "/usr/local/lib/python3.6/dist-packages/requests_unixsocket/adapters.py", line 41, in connect
    sock.connect(socket_path)
ConnectionRefusedError: [Errno 111] Connection refused

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.6/dist-packages/requests/adapters.py", line 449, in send
    timeout=timeout
  File "/usr/local/lib/python3.6/dist-packages/urllib3/connectionpool.py", line 725, in urlopen
    method, url, error=e, _pool=self, _stacktrace=sys.exc_info()[2]
  File "/usr/local/lib/python3.6/dist-packages/urllib3/util/retry.py", line 403, in increment
    raise six.reraise(type(error), error, _stacktrace)
  File "/usr/local/lib/python3.6/dist-packages/urllib3/packages/six.py", line 734, in reraise
    raise value.with_traceback(tb)
  File "/usr/local/lib/python3.6/dist-packages/urllib3/connectionpool.py", line 677, in urlopen
    chunked=chunked,
  File "/usr/local/lib/python3.6/dist-packages/urllib3/connectionpool.py", line 392, in _make_request
    conn.request(method, url, **httplib_request_kw)
  File "/usr/lib/python3.6/http/client.py", line 1264, in request
    self._send_request(method, url, body, headers, encode_chunked)
  File "/usr/lib/python3.6/http/client.py", line 1310, in _send_request
    self.endheaders(body, encode_chunked=encode_chunked)
  File "/usr/lib/python3.6/http/client.py", line 1259, in endheaders
    self._send_output(message_body, encode_chunked=encode_chunked)
  File "/usr/lib/python3.6/http/client.py", line 1038, in _send_output
    self.send(msg)
  File "/usr/lib/python3.6/http/client.py", line 976, in send
    self.connect()
  File "/usr/local/lib/python3.6/dist-packages/requests_unixsocket/adapters.py", line 41, in connect
    sock.connect(socket_path)
urllib3.exceptions.ProtocolError: ('Connection aborted.', ConnectionRefusedError(111, 'Connection refused'))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.6/dist-packages/pylxd/client.py", line 308, in __init__
    response = self.api.get()
  File "/usr/local/lib/python3.6/dist-packages/pylxd/client.py", line 158, in get
    response = self.session.get(self._api_endpoint, *args, **kwargs)
  File "/usr/local/lib/python3.6/dist-packages/requests/sessions.py", line 543, in get
    return self.request('GET', url, **kwargs)
  File "/usr/local/lib/python3.6/dist-packages/requests/sessions.py", line 530, in request
    resp = self.send(prep, **send_kwargs)
  File "/usr/local/lib/python3.6/dist-packages/requests/sessions.py", line 643, in send
    r = adapter.send(request, **kwargs)
  File "/usr/local/lib/python3.6/dist-packages/requests/adapters.py", line 498, in send
    raise ConnectionError(err, request=request)
requests.exceptions.ConnectionError: ('Connection aborted.', ConnectionRefusedError(111, 'Connection refused'))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.6/dist-packages/pylxd/client.py", line 315, in __init__
    raise exceptions.ClientConnectionFailed()
pylxd.exceptions.ClientConnectionFailed

I'm using pylxd on a lot of system without issue, that'sthe first time I'm seeing this, do you have any idea what I should do to debug?

Every lxc commands works correctly on the host.

[AceSlash]

Also remote connection using certificate works correctly with pylxd.

[ajkavanagh]

Which versions of:

pylxd
LXD

?

[AceSlash]

• pylxd version 2.2.10 (installed via pip3)
• lxd version 4.0.3 (from snap), you can see the full version and lxc info on https://github.com/lxc/lxd/issues/7818 (that's the same host)

[AceSlash]

Do you need any more information?