Solution: User 'sa 'logon fails. Cause: it is not associated with a trusted SQL server connection. [Mongoanytao]

Solution: User 'sa 'logon fails. Cause: it is not associated with a trusted SQL server connection.

I encountered this problem during my authentication today, so I sorted out my solutions for my friends who encountered the same problem:

Problem description:
User 'sa 'Login Failed. Cause: it is not associated with a trusted SQL server connection.
 Note:An error occurred while executing the current Web request. Check the stack trace information for details about the error and the source of the error in the code.

Exception details:System. Data. sqlclient. sqlexception: User 'sa 'Logon Failed. Cause: it is not associated with a trusted SQL server connection.

Source error:

Row 118: sqlcommand cmd = new sqlcommand (SQL, con); row 119: Row 120: con. open (); row 121:

My solution steps:
This problem is generally caused by SQL Server being integrated with Windows authentication, so the solution is:

1. Open the SQL Server Enterprise Manager.
2. Right-click the server name and select "Edit SQL Server Registration attributes". Then, select "use Windows Authentication" in the dialog box ".
3. Try it. No. Check the security settings.
4. Right-click "properties" and open the "Security" tab.
5. On the tab, select "SQL Server and Windows" for authentication.

6 OK.