Fixing Failed SQL Server Login

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Ngày cập nhật gần nhất: 15/4/2026

If attempting to log in to the database using Server Authentication, you may encounter an error stating 'Login failed. Login fail for user usrLogin. (Microsoft SQL Server, Error: 4064)'. So how do you fix it? Read on to explore the solution in the article below by Mytour.

The reason for the failed SQL Server login could be that the default database set for the specific login has been deleted. To fix the failed SQL Server login, the solution is to update the login information to create the default database.

To fix the failed SQL Server login, follow the steps below:

To begin, open the Command Prompt window and enter the following command:

- For SQL 2005:

Use the command below to fix SQL Server login failure:

osql -S SQL01 -d master -U usrlogin -P usrpassword

Execute the following command to adjust the default database for user login: ALTER LOGIN usrlogin WITH DEFAULT_DATABASE=new_default_db

Try installing SQL Server 2019 to resolve SQL Server login issues effectively.

Explore more: How to Install SQL Server 2019

- For SQL 2000:

Use the command below to fix SQL Server login failure:

Use the command: isql -S SQL01 -d master -U usrlogin -P usrpassword (opens query analyzer, then type the following line) sp_defaultdb 'usrlogin', ' new_default_db'

By executing the commands mentioned by Mytour above to fix SQL Server login failure issues. Additionally, there are some SQL Server login errors related to the SA account that Mytour has mentioned, so you can explore another method to log in to SQL Server. However, it is best, before performing any critical operations, to backup and restore SQL Server to ensure your data and information are always safeguarded, preventing any loss. Best of luck.

Frequently Asked Questions

What should I do if my SQL Server login fails with error 4064?

If you encounter 'Login failed. Login fail for user usrLogin. (Microsoft SQL Server, Error: 4064)', the likely cause is a missing default database for the user. To resolve this, update the login settings to create or change the default database using the appropriate commands for your SQL version.

How can I change the default database for a user in SQL Server?

To change the default database for a user, open Command Prompt and enter the command: ALTER LOGIN usrlogin WITH DEFAULT_DATABASE=new_default_db for SQL Server 2005 or use sp_defaultdb for SQL Server 2000. Ensure you have the correct permissions to perform these actions.

Is it recommended to back up SQL Server before making login changes?

Yes, it is highly recommended to back up SQL Server before making any changes to user logins or databases. This precaution ensures your data remains safe and recoverable in case of unexpected issues or errors during the process.

Can installing SQL Server 2019 help resolve login issues?

Yes, installing SQL Server 2019 can effectively help resolve various SQL Server login issues, including error 4064. The newer version may offer improved features and better compatibility that could address existing problems with user logins.

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