title: Microsoft SQL Server Error: 18456 + windows authentication
body: <p>My PC name is <code>IBALL1</code>. I get an error</p>
  
  <blockquote>
    <p>Login Failed for user 'iball1\User1'.(Microsoft SQL server, Error: 18456)</p>
  </blockquote>
  
  <p>I am trying to log in using Windows authentication.</p>
  
  <p>And in SQL Server Configuration Manager > SQl Server Service > SQL Server Logon As Local System.</p>
  
  <p>In error log text file, at <code>C:\Program Files\Microsoft SQL Server\MSSQL11.MSSQLSERVER\MSSQL\Log</code></p>
  
  <p>Log says:</p>
  
  <blockquote>
    <p>Login failed for user 'iball1\User1'. Reason: Could not find a login matching the name provided. [CLIENT: local machine]</p>
  </blockquote>