title: App Config - The Login is from an untrusted domain
body: <p>First, I try to connect to sql server of other computer(PC1-PC\Instance1) through ssms with Windows Authentication but got this error </p>
  
  <p><code>Login failed. The login is from an untrusted domain and cannot be used with Windows authentication.</code></p>
  
  <p>I resolve the error when I edit the password of sa to <code>1234</code> in PC1-PC\Instance1. Then connect in the ssms with SQL Server Authentication. And successfully connected.</p>
  
  <p>The problem is in my Winforms app config, I set the connection to this:</p>
  
  <pre><code>&lt;connectionStrings&gt;
  &lt;add name="LibrarySystem.Properties.Settings.LibraryConnectionString" connectionString="Data Source=PC1-PC\Instance1;
       Initial Catalog=System1;Integrated Security=True;MultipleActiveResultSets=True;User id = sa;Password = 1234" providerName="System.Data.SqlClient"/&gt;
  </code></pre>
  
  <p></p>
  
  <p>But I got this error <code>Login failed. The login is from an untrusted domain and cannot be used with Windows authentication.</code> </p>