Was working yesterday... now ERR_CONNECTION_CLOSED



React app using webpack.
This stack was working fine until today.
Start function does this:
“start”: “node ./node_modules/webpack-dev-server/bin/webpack-dev-server.js”,

configuration looks like this:

  devServer: {
    historyApiFallback: true,
    host: '',
    port: 8080,
    disableHostCheck: true,
    contentBase: './'

and error when attempting to preview:

GET https://react-tutorials-karlkras.c9users.io/ net::ERR_CONNECTION_CLOSED
Navigated to data:text/html,chromewebdata

Just when I thought I had this stuff worked out…

Any ideas/help here would be appreciated.

PS: Exact same setup was running beautifully for the past week… I haven’t touched a thing.


And it gets worse…
So I’ve created a new workspace… created a static index.html page, selected to preview the file and:
preview.c9users.io unexpectedly closed the connection.

maybe a firewall issue, but I haven’t done anything to my system since it was all working fine as of yesterday.