title: Oracle 12c connection error:-Got minus one from a read call
body: <p>My Sql developer was working fine from long time, suddenly from yesterday when i am trying to reconnect it is giving me following error:-</p>
  
  <pre><code>Status : Failure -Test failed: IO Error: Got minus one from a read call, connect lapse 62991 ms., Authentication lapse 0 ms.
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/xP2jB.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/xP2jB.png" alt="enter image description here"></a></p>
  
  <p><strong>Things I tried to solve the issue:-</strong>  </p>
  
  <ol>
  <li>Made corresponding changes in <code>sqlnet.ora</code> , <code>listener.ora</code> and <code>tnsnames.ora</code> files  </li>
  <li>Checked is there are too many open connections to the database service.   </li>
  <li>Restarted ORACLE service and listener  </li>
  <li>Firewall related changes   </li>
  <li>Reinstalled ORACLE   </li>
  </ol>