[BUG] Duplicate generated ports causing infinite loop

Describe the bug

The random ports generated in /server/utils/randomNum.js will have to pass duplicate port numbers to /server/index.js when high - low < countofPorts. This renders index.js file to enter infinite loop.

To Reproduce

Steps to reproduce the behavior:

1. Go to /
2. Edit config.json for range.high-range.low < count .
3. Open terminal and run npm start
4. See error (infinite loop)

Expected behavior

If the provided range is less than countofPorts, show error and display a message.