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Check connectivity: Confirm that your network is stable and you can connect to the MongoDB database from your machine.
Check authorization: Ensure that the user credentials you are using to connect to the database are correct and that the user has the necessary permissions.
Verify host and port number: Ensure you have entered the correct host address and port number in the connection string.
Verify replica set name: The replica set name may not be the same as the one specified in the connection string. Ensure that you have the correct replica set name.
Check firewall settings: If your network has a firewall, check if it is blocking traffic to the database. You can temporarily disable it to test if that is the cause of the connection difficulty.
Upgrade MongoDB Compass: Newer versions may have fixes to bugs causing these difficulties.
Contact Support: If the above steps do not resolve the issue, contact MongoDB Support for further assistance.