ERROR: The DNS operation timed out after 21.122084140777588 seconds (ConfigurationError)

 Traceback (most recent call last):

   File "/data/mci/984c33e834a32b6c7f8321beea54412f/src/pymongo/srv_resolver.py", line 72, in _resolve_uri

     results = resolver.query('_mongodb._tcp.' + self.__fqdn, 'SRV',

   File "/data/mci/984c33e834a32b6c7f8321beea54412f/src/test/utils.py", line 307, in __call__

     return self._function(*args, **kwargs)

   File "/opt/python/3.8/lib/python3.8/site-packages/dns/resolver.py", line 1221, in query

     return resolve(qname, rdtype, rdclass, tcp, source,

   File "/opt/python/3.8/lib/python3.8/site-packages/dns/resolver.py", line 1205, in resolve

     return get_default_resolver().resolve(qname, rdtype, rdclass, tcp, source,

   File "/opt/python/3.8/lib/python3.8/site-packages/dns/resolver.py", line 1043, in resolve

     timeout = self._compute_timeout(start, lifetime)

   File "/opt/python/3.8/lib/python3.8/site-packages/dns/resolver.py", line 950, in _compute_timeout

     raise Timeout(timeout=duration)

 dns.exception.Timeout: The DNS operation timed out after 21.122084140777588 seconds

 During handling of the above exception, another exception occurred:

 Traceback (most recent call last):

   File "/data/mci/984c33e834a32b6c7f8321beea54412f/src/test/test_srv_polling.py", line 165, in test_addition

     self.run_scenario(response, True)

   File "/data/mci/984c33e834a32b6c7f8321beea54412f/src/test/test_srv_polling.py", line 153, in run_scenario

     client = MongoClient(self.CONNECTION_STRING)

   File "/data/mci/984c33e834a32b6c7f8321beea54412f/src/pymongo/mongo_client.py", line 639, in __init__

     res = uri_parser.parse_uri(

   File "/data/mci/984c33e834a32b6c7f8321beea54412f/src/pymongo/uri_parser.py", line 500, in parse_uri

     nodes = dns_resolver.get_hosts()

   File "/data/mci/984c33e834a32b6c7f8321beea54412f/src/pymongo/srv_resolver.py", line 102, in get_hosts

     _, nodes = self._get_srv_response_and_hosts(True)

   File "/data/mci/984c33e834a32b6c7f8321beea54412f/src/pymongo/srv_resolver.py", line 83, in _get_srv_response_and_hosts

     results = self._resolve_uri(encapsulate_errors)

   File "/data/mci/984c33e834a32b6c7f8321beea54412f/src/pymongo/srv_resolver.py", line 79, in _resolve_uri

     raise ConfigurationError(str(exc))

 pymongo.errors.ConfigurationError: The DNS operation timed out after 21.122084140777588 seconds