Login failed user. The user is not associated with a trusted SQL server connection. C#

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SQL Server 2005 over LAN with c# windows application- login failed user. the user is not associated with a trusted sql server connection.
.........
I am attempting to use the following code to establish a connection to a SQL
Server database 2005 by using visual studio 2013/c#. However, when I execute the code, I receive the following
error:

login failed user . the user is not associated with a trusted sql server connection.
.
my database on the server it is work in microsoft access project but is not worked
when i Used c#.

when change my user domain to admin it is worked.

What I have tried:

//string connectionString = "Data Source=xxx.x.x.x,1433;Initial Catalog=Database;Integrated Security=SSPI;User ID=user1;Password=123456";
//string connectionString = "Data Source=xxx.x.x.x;Initial Catalog=Database2;Integrated Security=True";
// string connectionString = "Data Source=xxx.x.x.x;Database=Database2;User Id=user1;Password=123456;Persist Security Info=False";
// string connectionString = "Provider=SQLNCLI;Server=xxx.x.x.x;Database=Database2;Trusted_Connection=yes;";
// string connectionString = "Provider=SQLNCLI;Server=xxx.x.x.x;Database=Database2;Trusted_Connection=yes;MARS Connection=True;";
// string connectionString = " Provider=sqloledb;Data Source=xxx.x.x.x,1433;Network Library=DBMSSOCN;Initial Catalog=Database2;User ID=user1;Password=123456;";
string connectionString = " Provider=sqloledb;Data Source=xxx.x.x.x;Network Library=DBMSSOCN;Initial Catalog=Database2;User ID=user1;Password=123456;";

Posted 21-Aug-16 22:44pm

Adam_adam

Updated 31-Aug-16 21:54pm

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RickZeeland 22-Aug-16 6:37am

Maybe this helps: http://blog.sqlauthority.com/2014/01/17/sql-server-fix-login-failed-for-user-username-the-user-is-not-associated-with-a-trusted-sql-server-connection-microsoft-sql-server-error-18452/

ZurdoDev 22-Aug-16 7:53am

What is your question? You said, "when change my user domain to admin it is worked." So, you know it is a security problem that you need to fix. What do you want us to do?

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Jatinath · Answer 1 · 2016-08-31T21:54:00

Hi Jon,

you can use either of this way
Standard Security
Server=myServerAddress;Database=myDataBase;User Id=myUsername;
Password=myPassword;

Trusted Connection
Server=myServerAddress;Database=myDataBase;Trusted_Connection=True;

Connection to a SQL Server instance
The server/instance name syntax used in the server option is the same for all SQL Server connection strings.
Server=myServerName\myInstanceName;Database=myDataBase;User Id=myUsername;
Password=myPassword;

you can refer "https://www.connectionstrings.com/sql-server/" for help.

if it will not help you please copy your code so we can debug for it.