Waiting for hosts

Hi,
I have a long running pm2-web which worked perfectly until today. The UI just stays stuck on "waiting for hosts..."

Everything looks fine in the logs, no errors, correct config (nothing has changed so it has to be).

```
"www": {
[pm2-web-2 (out)] "host": "localhost",
[pm2-web-2 (out)] "address": "0.0.0.0",
[pm2-web-2 (out)] "port": 9000,
[pm2-web-2 (out)] "authentication": {
[pm2-web-2 (out)] "enabled": false,
[pm2-web-2 (out)] "username": "a_user_name",
[pm2-web-2 (out)] "password": "**** LA LA LA, NOTHING TO SEE HERE ****"
[pm2-web-2 (out)] },
[pm2-web-2 (out)] "ssl": {
[pm2-web-2 (out)] "enabled": false,
[pm2-web-2 (out)] "upgrade": true,
[pm2-web-2 (out)] "port": 9001,
[pm2-web-2 (out)] "passphrase": "**** LA LA LA, NOTHING TO SEE HERE ****",
[pm2-web-2 (out)] "key": "/path/to/key/file",
[pm2-web-2 (out)] "certificate": "/path/to/certificate/file"
[pm2-web-2 (out)] }
[pm2-web-2 (out)] },
```

And the startup looks fine too :

```
[pm2-web-2 (out)] 2015-05-25T03:15:01.366Z - info: Express server listening on 0.0.0.0:9000
[pm2-web-2 (out)] 2015-05-25T03:15:01.372Z - info: PM2Listener localhost RPC socket ready
[pm2-web-2 (out)] 2015-05-25T03:15:01.372Z - info: PM2Listener Querying version number from localhost
[pm2-web-2 (out)] 2015-05-25T03:15:01.375Z - info: PM2Listener localhost is running pm2 0.11.1
[pm2-web-2 (out)] GET /js/vendor/angular/angular-route.js 304 5.739 ms - -
[pm2-web-2 (out)] GET /js/vendor/angular/angular.js 304 4.022 ms - -
[pm2-web-2 (out)] GET /js/vendor/highcharts/highcharts-all.js 304 1.803 ms - -
[pm2-web-2 (out)] GET /css/reset.css 304 0.526 ms - -
[pm2-web-2 (out)] GET /css/bootstrap.css 304 0.461 ms - -
[pm2-web-2 (out)] GET /css/style.css 304 0.595 ms - -
[pm2-web-2 (out)] GET /js/vendor/highcharts-ng/highcharts-ng.min.js 304 0.504 ms - -
[pm2-web-2 (out)] GET /js/monitor.js 304 0.503 ms - -
[pm2-web-2 (out)] GET /js/vendor/reconnecting-websocket/reconnecting-websocket.min.js 304 0.382 ms - -
```

What could be causing the issue?

Just in case here's my etc/hosts file : 127.0.0.1 localhost localhost.localdomain

and I used to access the interface at : 54.221.XX.XXX:9000

I notice that the devtools just show the webResponder info message, but no connection seems to be established.. The mystery stays whole.