Error setting up entry SoundTouch 300 for soundtouch

Today I got an error:

2022-12-14 06:39:00.873 ERROR (MainThread) [homeassistant.config_entries] Error setting up entry SoundTouch 300 for soundtouch
Traceback (most recent call last):
File "/usr/local/lib/python3.10/site-packages/urllib3/connection.py", line 174, in _new_conn
conn = connection.create_connection(
File "/usr/local/lib/python3.10/site-packages/urllib3/util/connection.py", line 95, in create_connection
raise err
File "/usr/local/lib/python3.10/site-packages/urllib3/util/connection.py", line 85, in create_connection
sock.connect(sa)
OSError: [Errno 113] Host is unreachable
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/usr/local/lib/python3.10/site-packages/urllib3/connectionpool.py", line 703, in urlopen
httplib_response = self._make_request(
File "/usr/local/lib/python3.10/site-packages/urllib3/connectionpool.py", line 398, in _make_request
conn.request(method, url, **httplib_request_kw)
File "/usr/local/lib/python3.10/site-packages/urllib3/connection.py", line 239, in request
super(HTTPConnection, self).request(method, url, body=body, headers=headers)
File "/usr/local/lib/python3.10/http/client.py", line 1282, in request
self._send_request(method, url, body, headers, encode_chunked)
File "/usr/local/lib/python3.10/http/client.py", line 1328, in _send_request
self.endheaders(body, encode_chunked=encode_chunked)
File "/usr/local/lib/python3.10/http/client.py", line 1277, in endheaders
self._send_output(message_body, encode_chunked=encode_chunked)
File "/usr/local/lib/python3.10/http/client.py", line 1037, in _send_output
self.send(msg)
File "/usr/local/lib/python3.10/http/client.py", line 975, in send
self.connect()
File "/usr/local/lib/python3.10/site-packages/urllib3/connection.py", line 205, in connect
conn = self._new_conn()
File "/usr/local/lib/python3.10/site-packages/urllib3/connection.py", line 186, in _new_conn
raise NewConnectionError(
urllib3.exceptions.NewConnectionError: <urllib3.connection.HTTPConnection object at 0x14a4489f5b10>: Failed to establish a new connection: [Errno 113] Host is unreachable
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/usr/local/lib/python3.10/site-packages/requests/adapters.py", line 489, in send
resp = conn.urlopen(
File "/usr/local/lib/python3.10/site-packages/urllib3/connectionpool.py", line 787, in urlopen
retries = retries.increment(
File "/usr/local/lib/python3.10/site-packages/urllib3/util/retry.py", line 592, in increment
raise MaxRetryError(_pool, url, error or ResponseError(cause))
urllib3.exceptions.MaxRetryError: HTTPConnectionPool(host='192.168.0.138', port=8090): Max retries exceeded with url: /info (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x14a4489f5b10>: Failed to establish a new connection: [Errno 113] Host is unreachable'))
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/usr/src/homeassistant/homeassistant/config_entries.py", line 372, in async_setup
result = await component.async_setup_entry(hass, self)
File "/usr/src/homeassistant/homeassistant/components/soundtouch/__init__.py", line 130, in async_setup_entry
device = await hass.async_add_executor_job(soundtouch_device, entry.data[CONF_HOST])
File "/usr/local/lib/python3.10/concurrent/futures/thread.py", line 58, in run
result = self.fn(*self.args, **self.kwargs)
File "/usr/local/lib/python3.10/site-packages/libsoundtouch/__init__.py", line 23, in soundtouch_device
s_device = SoundTouchDevice(host, port)
File "/usr/local/lib/python3.10/site-packages/libsoundtouch/device.py", line 122, in __init__
self.__init_config()
File "/usr/local/lib/python3.10/site-packages/libsoundtouch/device.py", line 136, in __init_config
response = requests.get(
File "/usr/local/lib/python3.10/site-packages/requests/api.py", line 73, in get
return request("get", url, params=params, **kwargs)
File "/usr/local/lib/python3.10/site-packages/requests/api.py", line 59, in request
return session.request(method=method, url=url, **kwargs)
File "/usr/local/lib/python3.10/site-packages/requests/sessions.py", line 587, in request
resp = self.send(prep, **send_kwargs)
File "/usr/local/lib/python3.10/site-packages/requests/sessions.py", line 701, in send
r = adapter.send(request, **kwargs)
File "/usr/local/lib/python3.10/site-packages/requests/adapters.py", line 565, in send
raise ConnectionError(e, request=request)
requests.exceptions.ConnectionError: HTTPConnectionPool(host='192.168.0.138', port=8090): Max retries exceeded with url: /info (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x14a4489f5b10>: Failed to establish a new connection: [Errno 113] Host is unreachable'))

I’m running Home Assistant Core (dockerized) on a Unraid Server.

What could be the issue? Everything is up and running, network is also fine.

Thank you and Regards,
Lukas