azure sql login failed for user 18456

How to Fix Azure SQL Login Failed for User 18456


When working with Azure SQL, encountering login failures for user 18456 is a common issue that can be frustrating. This error indicates that a user's login attempt has failed, and it can be caused by various factors. In this article, we will dive deep into this problem and provide you with detailed solutions to fix the Azure SQL login failed for user 18456 error.

Understanding the Error

The error message "login failed for user 18456" typically indicates authentication or authorization problems when connecting to an Azure SQL database. This error can occur due to incorrect login credentials, limited permission settings, or other configuration issues.

Possible Causes of the Error

  1. Incorrect Username or Password: One of the most common reasons for this error is providing incorrect login credentials. Ensure that you have entered the correct username and password while attempting to connect to the Azure SQL database.

  2. Limited Permissions: If the user does not have sufficient permissions, they may face login failures. Double-check the user's permissions to ensure they have the necessary privileges to access the database.

  3. Firewall Configuration: Azure SQL has a firewall that restricts access to the database. If the client's IP address is not allowed through the firewall, it can result in login failures. Check if the client's IP address is added to the firewall rules.

  4. IP Address Whitelisting: In some cases, even if the firewall is correctly configured, the user's IP address might not be whitelisted to access the Azure SQL database. Make sure to include the user's IP address in the firewall whitelist.

  5. Expired Password: If the user's password has expired, attempting to log in with the expired password will result in login failures. Ensure that the user updates their password and then retry the login.

Solutions to Fix the Error

To resolve the Azure SQL login failed for user 18456 error, you can follow these steps:

Solution 1 - Verify Login Credentials

Ensure that the username and password entered to connect to the Azure SQL database are correct. Double-check for any typos or misspellings. If you are uncertain whether the credentials are accurate, consider resetting the password and trying again.

Solution 2 - Check User Permissions

Confirm that the user has appropriate permissions to access the Azure SQL database. In the Azure portal or using SQL Server Management Studio, review the user's permissions and grant them the necessary rights if needed. Make sure the user has the correct roles, such as db_datareader, db_datawriter, or any other required roles.

Solution 3 - Review Firewall Settings

Inspect the Azure SQL firewall rules to ensure that the client's IP address, from where the connection is initiated, is allowed through. Add or update the appropriate firewall rule to permit the client's IP address. Remember that Azure SQL firewall rules are specific to each database server.

Solution 4 - Whitelist User's IP Address

To avoid any IP address restrictions, add the user's IP address to the Azure SQL server's firewall whitelist. This step ensures that the user can establish a connection without being blocked by the firewall. You can find the firewall settings within the Azure portal or by using Azure PowerShell commands.

Frequently Asked Questions

Q1: How can I change the password for a user in Azure SQL?

To change the password for a user in Azure SQL, you can follow these steps:

  1. Connect to the Azure SQL database using an account that has administrative privileges.
  2. Open SQL Server Management Studio (SSMS) and log in using the admin user.
  3. Expand the "Security" folder in Object Explorer, then expand the "Logins" folder.
  4. Right-click on the user whose password you want to change and select "Properties".
  5. In the "General" tab, enter the new password in the "Password" and "Confirm Password" fields.
  6. Click "OK" to save the new password.

Q2: Can I use Azure Active Directory (Azure AD) authentication with Azure SQL?

Yes, Azure SQL supports Azure Active Directory (Azure AD) authentication. By leveraging Azure AD, you can authenticate users with their Azure AD accounts, eliminating the need for separate SQL Server authentication. This feature provides enhanced security and simplified user management.

Q3: How can I troubleshoot other Azure SQL connection errors?

If you are encountering connection errors other than the login failed for user 18456, you can try the following steps:

  1. Ensure that the server name and database name are correct.
  2. Check the network connectivity between your client and the Azure SQL server.
  3. Verify that the server is not in a maintenance state or experiencing any outages.
  4. Review the error messages or logs to find more specific details about the error.
  5. Consider adjusting the connection string parameters or configuration settings.


Dealing with the "Azure SQL login failed for user 18456" error requires a thorough understanding of the possible causes and appropriate solutions. By following the steps outlined in this article, you should be able to resolve this login failure and successfully connect to your Azure SQL database. Remember to validate your login credentials, user permissions, firewall settings, and whitelisted IP addresses to ensure a smooth connection process.

Error 18456 in Azure SQL : Cannot connect to .database ...

Login failed for user 'NT AUTHORITY\ANONYMOUS LOGON'. (Microsoft SQL Server Error: 18456) The error is somewhat misleading. Typically it has nothing to do with an anonymous logon.

Microsoft SQL Server Error 18456 SOLVED! | Liquid Web ...

If you find Windows Authentication is the only mode configured this is the likely cause of Error 18456 Login failed for user 'username'. Setting the Server authentication mode to allow SQL Server and Windows Authentication you will be able to login to MS-SQL with a SQL user and password or a Windows user and password.

How To Fix Login Failed for User Microsoft SQL Server ...

The generic message "Login Failed for User (Microsoft SQL Server Error: 18456)" means you entered invalid credentials when logging into SQL Server. In the below screen shot I am logging into Microsoft SQL Server Management Studio with a user that does not have administrative permissions to connect to the server.

logins - Azure SQL Server Database Error: 18456 Severity ...

To get there in the Azure portal Choose All services and then Subscriptions ; Choose your subscription; Choose Access control (IAM) Click Add In the Add permissions screen that follows a. set the Role to "Owner" b. set the Assign access field to "Azure AD user group or application" c. find the new account admin user in the list titled Select

MSSQLSERVER_18456 - SQL Server | Microsoft Docs

When a connection attempt is rejected because of an authentication failure that involves a bad password or user name a message similar to the following is returned to the client: "Login failed for user 'user_name'. (Microsoft SQL Server Error: 18456)". Additional information returned to the client includes the following:

Troubleshooting Error 18456 -

If you connect with a contained user but forget to specify a database name SQL Server will attempt to authorize you as a SQL login and you will fail with state 5 (if there is no SQL login with that name) or state 8 (if there is also a SQL login with the same name and the password doesn't match).

SQL: Fix - Login failed for user 'NT AUTHORITY\ANONYMOUS ...

After I authorized the logon I would then receive the error shown in the main image: Login failed for user 'NT AUTHORITY\ANONYMOUS' and Error 18456. Now when I've seen this error before with on-premises SQL Server it's usually a Kerberos problem or a double-hop problem. But this was direct to Azure SQL Database.

Login Failed for user '' - Microsoft Q&A

The error "`Microsoft SQL Server Error: 18456 token-identified-principal`" means that the user used to login to SQL Server Management Studio is invalid. It is usually related to an AAD user which is not added on SQL DB that you are trying to connect (User DB or Master DB) or that the AAD user is not the AAD Server Admin.

Azure - Error Number: 18456 Error Code: -2146232060 ...

If you wish to add a separate user account that only has access to this database for a specific application which is a recommended practice for security you will need to use SQL Manager Visual Studio or another utility to connect to the database and provision a new virtual user account with privileges to this particular database.

How to debug 'Login failed for user' on an Azure SQL ...

You can download and open the.xel -file in SSMS (File / Open / File…). The xel file contains events and you can see login attempts there. Event field succeeded tells if the login failed or not and field server_principal_name contains the username in both cases. From text in field additional_information you can find error_code (in the xml).


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