Inform user they've specified a HOST

Created by: everdrone

OS

macOS 10.13.2

Node

node -v: 9.3.0 npm -v: 5.6.0 yarn -v: 1.3.2

output:

$ yarn start                                                                                                                                                                                       06:51:09
yarn run v1.3.2
warning ../../../package.json: No license field
$ react-scripts start
Could not find an open port at Giorgios-MacBook-Pro.
Network error message: listen EADDRNOTAVAIL 54.72.52.58

error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

---

rebooted many times, updated node and npm, updated yarn and create-react-app, but this only seems to works with sudo.

i also tried to reinstall node with nvm, after stumbling against many reports that suggested this was the cause of my issue.

this is probably a stupid bug, but it's driving me crazy since yesterday, please help.