SQL connection: Target principal name incorrect

Question

Our Developer want to upgrade his website .net 8.0 from .net core 3.1, and downloaded System.Data.SqlClient (04.8.6),

Have fixed all issues in debug machine.

 

Problem occurs when published to the production website, has got the following error:

 

Win32Exception: The target principal name is incorrect.

SqlException: A connection was successfully established with the server, but then an error occurred during the login process. (provider: SSL Provider, error: 0 - The target principal name is incorrect.)

 

 

            Further details form log is as below:

 

Microsoft.Data.SqlClient.SqlException (0x80131904): A connection was successfully established with the server, but then an error occurred during the login process. (provider: SSL Provider, error: 0 - The target principal name is incorrect.)

---> System.ComponentModel.Win32Exception (0x80090322): The target principal name is incorrect.

Answer 1

Hi @Tommy Lau,

Try adding TrustServerCertificate=True; or adding Encrypt=False to your connection string.

Regards，

Zoe Hui

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Answer 2

To start with, he should use Microsoft.Data.SqlClient which has superceded System.Data.SqlClient.

Since recent versions of Microsoft.Data.SqlClient defaults to require an encrypted connection, this may lead to other errors, but we will see.