title: create localhost connection in Oracle SQL Developer Tool
body: <p>I want to create localhost connection in Oracle SQL Developer tool
  my credentials are </p>
  
  <pre>
  username : SYSTEM
  password : SYSTEM
  Hostname :localhost or 127.0.0.1
  port     : 1521
  sid      : xe
  </pre>
  
  <p>When i connect i gives error The Network Adapter could not establish connection</p>