title: Cannot login to SQL Server 2012 after changing Server Name
body: <p>I know this has been asked before but I couldn't find a solution... I had to change a server name for a SQL Server 2012 machine after moving it to a new domain. I was able to log into single user mode and enable SQL Server authentication and add a SQL Server user. I'm able to login that way, but the software that uses the DBs on the server require Windows Authentication. </p>
  
  <p>I've tried running </p>
  
  <pre><code>sp_addserver 'Servername', local; 
  </code></pre>
  
  <p>The server responds with The server already exists, but I still cannot login with Windows Authentication... please help.</p>