title: I can't connect to the Oracle server using SQL Developer
body: <p>when I installed oracle 11g and SQL developer it worked properly and after some times I have disabled an oracle startup using third-party software and I can't find what happened now I can't connect to my server now.
  I'm using Windows OS</p>
  <blockquote>
  <p>the error when I open my oracle XE using the browser
  <a href="http://127.0.0.1:8080/apex/f?p=4950" rel="nofollow noreferrer">http://127.0.0.1:8080/apex/f?p=4950</a>
  Firefox can’t establish a connection to the server at 127.0.0.1:8080.</p>
  </blockquote>
  <p>when I open my SQL developer and  try to connect</p>
  <blockquote>
  <p>An error was encountered performing the requested operation:</p>
  </blockquote>
  <blockquote>
  <p>Listener refused the connection with the following error:
  ORA-12505, TNS:listener does not currently know of SID given in connect descriptor</p>
  </blockquote>
  <blockquote>
  <p>Vendor code 12505</p>
  </blockquote>