title: Closing of multiple port using express app
body: <p>I am running multiple server instance of a app on different port using "npm run node_1 &amp; npm run node_2 &amp;" , this successfully runs my localhost on 3001 and 3002 . But when i try to close it using CTRL+C it only closes the first defined port and the other one still remains in use giving error below , when i run it again</p>
  
  <p>[nodemon] starting <code>node ./networkNode.js 3002 http://localhost:3002</code>
  events.js:173
        throw er; // Unhandled 'error' event
        ^</p>
  
  <p>Error: listen EADDRINUSE: address already in use :::3002</p>
  
  <pre><code>My package.json :
  
  "scripts": {
      "node_1": "nodemon --watch . -e js ./networkNode.js 3001 
             http://localhost:3001",
      "node_2": "nodemon --watch . -e js ./networkNode.js 3002 
             http://localhost:3002",
    },
  
  </code></pre>