Learn how to resolve the “integrated authentication failed clientconnectionid“ error. Our SQL Server Support team is here to help you with your questions and concerns.

Integrated Authentication Failed ClientConnectionId | Resolved

If you have been running into authentication errors when connecting Java applications to SQL Server databases, we have your back.

One common error message is the “Integrated authentication failed” issue. It is accompanied by a `com.microsoft.sqlserver.jdbc.SQLServerException`.

Today, our experts are going to explore the root causes and solutions.

Let’s break down the error message.

The `Integrated authentication failed` message indicates a problem with Windows Authentication. Especially, when we use the `authenticationScheme=JavaKerberos` parameter in the connection string.

Solutions and Workarounds

1. If we have the `sqljdbc_auth.dll` file, we don’t need to specify the `JavaKerberos` authentication scheme. In other words, omit this parameter from the connection string.
2. If we connect as the user logged into Windows, ensure `integratedSecurity=true` is included in the connection string. Windows Authentication does not require a username or password.
3. Additionally, if we want to connect as a different user or we are not on Windows, we need to use Kerberos authentication. So, include `authenticationScheme=JavaKerberos` in the connection string. Also, we have to set up the necessary Kerberos-related Java properties.
4. Furthermore, configure the following Java properties for Kerberos authentication:
   • `java.security.auth.login.config`:

     Optionally, configure a login context configuration file for advanced behavior control.
   • `java.security.krb5.realm`:

     Set the Kerberos realm.
   • `java.security.krb5.kdc`:

     Set the Kerberos Key Distribution Center (KDC).

Let us know in the comments if you need further help with the error.

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Conclusion

In brief, our Support Experts demonstrated how to fix the “integrated authentication failed clientconnectionid” error.