Learn how to fix Command Failed with Error 18 (Authentication Failed). Our MongoDB Support team is here to help you with your questions and concerns.
Command Failed with Error 18 (Authentication Failed) | Fixed
The “command failed with error 18 (AuthenticationFailed)” error in MongoDB is due to a failure in the authentication process.
This error can be due to several issues. Today, we are going to take a close look at the common causes and how to fix them.
Common Causes & Fixes
- Incorrect Username or Password :
One of the most common reasons for this error is incorrect login credentials.
Fix: So, double-check the username and password in the connection string. Furthermore, use the MongoDB shell to test the credentials by running the `mongo` command and authenticating with the `db.auth()` method.
- Connecting to the Wrong Database:
Sometimes, the credentials might be valid but stored in a different database than the one we are trying to connect to.
Fix: So, make sure the `spring.data.mongodb.authentication-database` property is set to the correct database, usually the `admin` database where user credentials are stored.
- Mismatched Keyfile in Replica Sets :
If we are connecting to a MongoDB replica set, the keyfile used for authentication must be identical on all nodes in the replica set.
Fix: Hence, verify that the keyfile is correctly configured and matches across all members of the replica set.
- Incorrect Connection String:
An incorrectly formatted connection string can also lead to authentication failures.
Fix: So, double-check the host, port, and database name in the connection string. Also, make sure that the connection string is properly formatted and matches the MongoDB instance we are trying to connect to.
- Incorrect MongoDB Docker Configuration:
When running MongoDB in a Docker container, incorrect environment variables can cause authentication issues.
Fix: So, verify that the environment variables for the root username, password, and database are correctly set. Also, make sure the Docker container is running and accessible from our application.
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Conclusion
In brief, our Support Experts demonstrated how to fix Command Failed with Error 18 (Authentication Failed)
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