problem connecting and query db in pymongo 4.0.1

In [3]: from pymongo import MongoClient

   ...:

   ...: client = MongoClient()

   ...: db = client["mydb"]

   ...: [*db.controlUnit.find()]

---------------------------------------------------------------------------

ServerSelectionTimeoutError               Traceback (most recent call last)

Input In [3], in <module>

      3 client = MongoClient()

      4 db = client["hpf-larss-data-access"]

----> 5 [*db.controlUnit.find()]File C:\Anaconda3\lib\site-packages\pymongo\cursor.py:1159, in Cursor.next(self)

   1157 if self.__empty:

   1158     raise StopIteration

-> 1159 if len(self.__data) or self._refresh():

   1160     return self.__data.popleft()

   1161 else:File C:\Anaconda3\lib\site-packages\pymongo\cursor.py:1057, in Cursor._refresh(self)

   1054     return len(self.__data)

   1056 if not self.__session:

-> 1057     self.__session = self.__collection.database.client._ensure_session()

   1059 if self.__id is None:  # Query

   1060     if (self.__min or self.__max) and not self.__hint:File C:\Anaconda3\lib\site-packages\pymongo\mongo_client.py:1603, in MongoClient._ensure_session(self, session)

   1598     return session

   1600 try:

   1601     # Don't make implicit sessions causally consistent. Applications

   1602     # should always opt-in.

-> 1603     return self.__start_session(True, causal_consistency=False)

   1604 except (ConfigurationError, InvalidOperation):

   1605     # Sessions not supported.

   1606     return NoneFile C:\Anaconda3\lib\site-packages\pymongo\mongo_client.py:1553, in MongoClient.__start_session(self, implicit, **kwargs)

   1551 def __start_session(self, implicit, **kwargs):

   1552     # Raises ConfigurationError if sessions are not supported.

-> 1553     server_session = self._get_server_session()

   1554     opts = client_session.SessionOptions(**kwargs)

   1555     return client_session.ClientSession(

   1556         self, server_session, opts, implicit)File C:\Anaconda3\lib\site-packages\pymongo\mongo_client.py:1589, in MongoClient._get_server_session(self)

   1587 def _get_server_session(self):

   1588     """Internal: start or resume a _ServerSession."""

-> 1589     return self._topology.get_server_session()File C:\Anaconda3\lib\site-packages\pymongo\topology.py:530, in Topology.get_server_session(self)

    527 with self._lock:

    528     # Sessions are always supported in load balanced mode.

    529     if not self._settings.load_balanced:

--> 530         session_timeout = self._check_session_support()

    531     else:

    532         # Sessions never time out in load balanced mode.

    533         session_timeout = float('inf')File C:\Anaconda3\lib\site-packages\pymongo\topology.py:514, in Topology._check_session_support(self)

    509         self._select_servers_loop(

    510             any_server_selector,

    511             self._settings.server_selection_timeout,

    512             None)

    513 elif not self._description.readable_servers:

--> 514     self._select_servers_loop(

    515         readable_server_selector,

    516         self._settings.server_selection_timeout,

    517         None)

    519 session_timeout = self._description.logical_session_timeout_minutes

    520 if session_timeout is None:File C:\Anaconda3\lib\site-packages\pymongo\topology.py:216, in Topology._select_servers_loop(self, selector, timeout, address)

    213 while not server_descriptions:

    214     # No suitable servers.

    215     if timeout == 0 or now > end_time:

--> 216         raise ServerSelectionTimeoutError(

    217             "%s, Timeout: %ss, Topology Description: %r" %

    218             (self._error_message(selector), timeout, self.description))

    220     self._ensure_opened()

    221     self._request_check_all()ServerSelectionTimeoutError: mongodb1:27017: [Errno 11001] getaddrinfo failed,mongodb2:27018: [Errno 11001] getaddrinfo failed,mongodb3:27019: [Errno 11001] getaddrinfo failed, Timeout: 30s, Topology Description: <TopologyDescription id: 61f1800055c0a2a6b98c18b6, topology_type: ReplicaSetNoPrimary, servers: [<ServerDescription ('mongodb1', 27017) server_type: Unknown, rtt: None, error=AutoReconnect('mongodb1:27017: [Errno 11001] getaddrinfo failed')>, <ServerDescription ('mongodb2', 27018) server_type: Unknown, rtt: None, error=AutoReconnect('mongodb2:27018: [Errno 11001] getaddrinfo failed')>, <ServerDescription ('mongodb3', 27019) server_type: Unknown, rtt: None, error=AutoReconnect('mongodb3:27019: [Errno 11001] getaddrinfo failed')>]>