SQL Server Error Msg 17832 – The login packet used to open the connection is structurally invalid; the connection has been closed

In this blog post, let’s learn about the error message “17832 – The login packet used to open the connection is structurally invalid; the connection has been closed. Please contact the vendor of the client library.%.*ls” in Microsoft SQL Server, the reason why it appears and the solution to fix it.

SQL Server Error Message

17832 – The login packet used to open the connection is structurally invalid; the connection has been closed. Please contact the vendor of the client library.%.*ls

Reason for the Error

The SQL Server error message “The login packet used to open the connection is structurally invalid; the connection has been closed. Please contact the vendor of the client library. %.*ls” usually occurs when there is an issue with the login packet used by the client application to connect to the SQL Server instance. This error indicates that the login packet received by the server is not formatted correctly, and the connection cannot be established.

Here are some examples of what can cause this error message to appear:

1. Using an incorrect version of the SQL Server client library to connect to the SQL Server instance.
2. An issue with the SQL Server instance, such as a corrupt system database or a network issue.
3. A configuration issue with the client application, such as an incorrect connection string.

Solution

To fix this error, you can try the following solutions:

1. Upgrade the SQL Server client library: If you are using an older version of the SQL Server client library, try upgrading to the latest version to see if that resolves the issue.
2. Check for SQL Server instance issues: Check the SQL Server instance for any issues, such as a corrupt system database, insufficient memory, or a network issue. You can also try restarting the SQL Server instance to see if that resolves the issue.
3. Check the client application configuration: Ensure that the client application is configured correctly, and the connection string is valid. Make sure the connection string includes the correct server name, port number, and authentication information.
4. Enable detailed error messages: If the error message does not provide enough information to diagnose the issue, you can enable detailed error messages in the SQL Server error log. This will provide more information about the issue and help in diagnosing the root cause.

Here’s an example of how to enable detailed error messages:

1. Open SQL Server Management Studio.
2. Right-click on the SQL Server instance and select Properties.
3. Click on the Advanced tab.
4. Scroll down to the “Miscellaneous” section and set the “Enable Failed Login Error Messages” property to True.
5. Click OK to save the changes.

Once you’ve enabled detailed error messages, you can check the SQL Server error log to see if it provides any additional information about the issue.