title: Status : Failure -Test failed: IO Error: An existing connection was forcibly closed by the remote host
body: <p>I have recently downloaded the oracle database 12c enterprise edition. So I got Oracle SQL developer installed with the package. I started to create <em>new database connection</em> as given in the documentation.</p>
  
  <p><strong>My problem is....</strong></p>
  
  <p><a href="https://i.stack.imgur.com/fJUXm.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/fJUXm.png" alt="enter image description here"></a>
  When I  try to test or connect with the following field values:
  Hostname: localhost
  Port: 1521
  SID: orcl (I have tried 'xe' as well but the error persists.)</p>
  
  <p>I get the following error:</p>
  
  <p>Status: Failure -Test failed: IO Error: An existing connection was forcibly closed by the remote host, connect lapse 15080 ms., Authentication lapse 0 ms.</p>
  
  <p><strong>I have also tried to use different port numbers but the issue remains the same. Don't know what went wrong.</strong></p>