Previously, a MongoDB server that was working without issues when hosted on Mongo Atlas, encountered authentication failure.

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This may be due to a number of reasons, such as incorrect login credentials, a change in the server configuration, or an issue with the network. To troubleshoot the issue, you can try the following steps:

1. Check your login credentials: Ensure that you are using the correct username and password for the MongoDB server. If you have recently updated your password, make sure you are using the updated password. You can also try resetting your password if you are not sure if you are using the correct login credentials.

2. Check the server configuration: Make sure that the MongoDB server is configured correctly. Check the security settings and make sure that the server is set up to allow remote connections. If necessary, update the server configurations to allow remote connections.

3. Check the network connection: Connection issues can sometimes occur due to firewall settings or network issues. Check your firewall and make sure that the port used by MongoDB is open. Try pinging the server to see if it is reachable, and try connecting to the server from a different network or machine to verify the issue.

4. Check the logs: MongoDB logs can provide important information about authentication failures. Check the logs to see if there are any error messages related to authentication failure, and investigate further based on the information in the log messages.

5. Contact support: If you are still unable to resolve the issue, you can contact the MongoDB support team for assistance. They can help you to diagnose and resolve the issue.