webpack-dev-server can't find localhost

Question

I\'m trying to get started with React using webpack, but keep running into an error when I try to set up webpack-dev-server

Answer 1

Also encountered the same error and nothing fixed it.

It appears, in my case, that I accidentally "corrupted" the /etc/hosts file by been able to write to it without the sudo permission.

The clue was when I cat /etc/hosts the output was one messy line. I deleted and re-created the file as sudo, with the @lizzie-cd link and all went back to normal