Unable to insert or retrieved data to MongoDB - mongodb

Question

I try to insert and pull some data from MongoDB.
The connection was setup correctly follow there instruction on mongodb.com
try:
client = MongoClient(
'mongodb+srv://user:pw!#cluster0-nghj0.gcp.mongodb.net/test?retryWrites=true',
ssl=True)
print("connected")
except:
print('failed')
I manually create a Database: messager.messager and put some json file in it
when I try to use collection.find() or collection.insert_one(...)
db = client.messager
collection = db.messager
for i in collection.find():
print(i)
It returns Timeout error:
File "/Users/anhnguyen/Documents/GitHub/GoogleCloud_Flask/comming soon/env/lib/python3.7/site-packages/pymongo/cursor.py", line 1225, in next
if len(self.__data) or self._refresh():
File "/Users/anhnguyen/Documents/GitHub/GoogleCloud_Flask/comming soon/env/lib/python3.7/site-packages/pymongo/cursor.py", line 1117, in _refresh
self.__session = self.__collection.database.client._ensure_session()
File "/Users/anhnguyen/Documents/GitHub/GoogleCloud_Flask/comming soon/env/lib/python3.7/site-packages/pymongo/mongo_client.py", line 1598, in _ensure_session
return self.__start_session(True, causal_consistency=False)
File "/Users/anhnguyen/Documents/GitHub/GoogleCloud_Flask/comming soon/env/lib/python3.7/site-packages/pymongo/mongo_client.py", line 1551, in __start_session
server_session = self._get_server_session()
File "/Users/anhnguyen/Documents/GitHub/GoogleCloud_Flask/comming soon/env/lib/python3.7/site-packages/pymongo/mongo_client.py", line 1584, in _get_server_session
return self._topology.get_server_session()
File "/Users/anhnguyen/Documents/GitHub/GoogleCloud_Flask/comming soon/env/lib/python3.7/site-packages/pymongo/topology.py", line 434, in get_server_session
None)
File "/Users/anhnguyen/Documents/GitHub/GoogleCloud_Flask/comming soon/env/lib/python3.7/site-packages/pymongo/topology.py", line 200, in _select_servers_loop
self._error_message(selector))
pymongo.errors.ServerSelectionTimeoutError: connection closed,connection closed,connection closed
Where did it goes wrong ?
Here is my Mongodb.com setup:

Answer 1

From the pymongo documentation for errors you have the following issue.
exception pymongo.errors.ServerSelectionTimeoutError(message='', errors=None)
Thrown when no MongoDB server is available for an operation
If there is no suitable server for an operation PyMongo tries for serverSelectionTimeoutMS (default 30 seconds) to find one, then throws this exception. For example, it is thrown after attempting an operation when PyMongo cannot connect to any server, or if you attempt an insert into a replica set that has no primary and does not elect one within the timeout window, or if you attempt to query with a Read Preference that the replica set cannot satisfy.
You have to check whether your network has good connectivity to the network where your MongoDB server resides.
There might be a case, where the Primary Node of the Replica Set becomes unresponsive. In such cases you need to restart your cluster(if you have the access permissions).
Also, create the connections as follows:
mongo_conn = MongoClient('mongodb+srv://cluster0-nghj0.gcp.mongodb.net/test?retryWrites=true', username=your_username, password=pwd, authSource='admin', authMechanism='SCRAM-SHA-1')
above is the best practice to follow. mongodb+srv urls do not need the ssl=True mention.