title: Microsoft SQL Server , Error : 87
body: <p>I am really tired, it's been 3 days that I can't open my SQL Server Management Studio. I got connection string error with number 87. Below screenshot show my problem:</p>
  
  <p><img src="https://i.stack.imgur.com/nGSzV.png" alt="Picture number 1"></p>
  
  <p><img src="https://i.stack.imgur.com/Mo4MJ.png" alt="Picture number 2"></p>
  
  <p>And I use <code>localhost\MSSQLSERVER</code> with error 87 and <code>Arash-PC</code> (my machine name) with error number 2.</p>
  
  <p>And I tried <code>sqlcmd -U sa -S Arash-PC</code> too</p>