MongoDB · January 2, 2024

How to fix MongoDB Error Code - 11 - UserNotFound

How to Fix MongoDB Error Code - 11 - UserNotFound

MongoDB is a popular NoSQL database that offers high performance, scalability, and flexibility. However, like any other software, it can encounter errors that need to be resolved. One such error is MongoDB Error Code - 11 - UserNotFound. In this article, we will explore the causes of this error and provide step-by-step solutions to fix it.

Understanding MongoDB Error Code - 11 - UserNotFound

MongoDB Error Code - 11 - UserNotFound occurs when the database fails to find a user specified in an authentication request. This error typically arises when attempting to authenticate a user against a database that does not exist or when the user credentials are incorrect.

Possible Causes of MongoDB Error Code - 11 - UserNotFound

There are several potential causes for this error:

  • Incorrect Database Name: Ensure that you are specifying the correct database name when authenticating the user. Double-check the database name in your connection string or authentication command.
  • Incorrect Username or Password: Verify that the username and password you are using to authenticate the user are correct. Pay attention to uppercase and lowercase letters, as MongoDB is case-sensitive.
  • Missing User: If the user you are trying to authenticate does not exist in the specified database, you will encounter this error. Ensure that the user is created and assigned the necessary roles.
  • Incorrect Authentication Mechanism: MongoDB supports various authentication mechanisms, such as SCRAM-SHA-1, MONGODB-CR, and PLAIN. Make sure you are using the correct mechanism for your setup.

Step-by-Step Solutions to Fix MongoDB Error Code - 11 - UserNotFound

Follow these steps to resolve the UserNotFound error:

Step 1: Verify Database Name

Double-check the database name in your connection string or authentication command. Ensure that it matches the database where the user is created.

Step 2: Verify Username and Password

Confirm that the username and password you are using to authenticate the user are correct. Pay attention to any uppercase or lowercase letters.

Step 3: Check User Existence

Ensure that the user you are trying to authenticate exists in the specified database. If not, create the user and assign the necessary roles using the MongoDB shell or a database management tool.

Step 4: Check Authentication Mechanism

Verify that you are using the correct authentication mechanism for your MongoDB setup. Refer to the MongoDB documentation for the supported mechanisms and configure your authentication accordingly.

Step 5: Restart MongoDB Service

If the above steps do not resolve the issue, try restarting the MongoDB service. Sometimes, a simple restart can fix authentication-related problems.

Summary

In conclusion, MongoDB Error Code - 11 - UserNotFound occurs when the database fails to find a user specified in an authentication request. This error can be caused by incorrect database names, usernames, passwords, missing users, or incorrect authentication mechanisms. By following the step-by-step solutions outlined in this article, you can resolve this error and ensure smooth authentication in your MongoDB environment.

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