[SQL Server] A connection was successfully established with the server, but then an error occurred during the login process. (provider: SSL Provider, error: 0 - 此憑證鏈結是由不受信任的授權單位發出的。)

 今天寫程式連結資料庫，遇見這樣的錯誤

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 - 此憑證鏈結是由不受信任的授權單位發出的。)

環境  .NET Core 6 / VS 2022

 

資料來源： https://docs.microsoft.com/zh-tw/sql/connect/ado-net/sqlclient-troubleshooting-guide?view=sql-server-ver15 

解決方法：DB連結字串 ConnectionString

             需要額外加上 TrustServerCertificate=true。不然會出現錯誤

以 appsettings.json 設定檔為例

  "ConnectionStrings": {
   "DefaultConnection": "Server=.\\sqlexpress;Database=資料庫名稱;Trusted_Connection=True;TrustServerCertificate=true;MultipleActiveResultSets=true"
 },

 

相關的錯誤也都可以用上述相同解法

(1)  Microsoft.Data.SqlClient.SqlException (0x80131904): A connection was successfully established with the server, but then an error occurred during the pre-login handshake. (provider: SSL Provider, error: 31 - Encryption(ssl/tls) handshake failed) System.IO.EndOfStreamException: End of stream reached

(2)  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.)

(3)  Microsoft.Data.SqlClient.SqlException (0x80131904): Connection Timeout Expired. The timeout period elapsed during the post-login phase. The connection could have timed out while waiting for server to complete the login process and respond; Or it could have timed out while attempting to create multiple active connections. The duration spent while attempting to connect to this server was - [Pre-Login] initialization=837; handshake=394; [Login] initialization=3; authentication=15; [Post-Login] complete=1027; ---> System.ComponentModel.Win32Exception (258): Unknown error 258 at Microsoft.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action1 wrapCloseInAction)

 

 

 

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