title: Port 4200 is already in use. Use '--port' to specify a different port
body: <p>When trying to run <code>ng serve</code> I get the following error:</p>
  
  <pre><code>Port 4200 is already in use. Use '--port' to specify a different port.
  npm ERR! code ELIFECYCLE
  npm ERR! errno 1
  npm ERR! product@0.0.0 start: `ng serve --host 0.0.0.0 --disable-host-check`
  npm ERR! Exit status 1
  npm ERR!
  npm ERR! Failed at the product@0.0.0 start script.
  npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
  
  npm ERR! A complete log of this run can be found in:
  npm ERR!     C:\Users\Mohammad Ajo\AppData\Roaming\npm-cache\_logs\2019-08-18T18_19_41_366Z-debug.log
  </code></pre>
  
  <p>I've checked the port if it's reserved by another connection or not and tried to change the port multiple times with not and keep getting the same error.</p>