C9.IO - Debugging Failed - Failed to open socket on port 15400, waiting 1000 ms before retrying

The code in C9.IO it's...

var http = require("http");
http.createServer(function(req, res) {
    res.end("Hello world from Cloud9!");
}).listen(process.env.PORT, process.env.IP);    

The result at debug...

Your code is running at 'http://demo-project.gerardogrimaldi.c9.io'.

Important: use 'process.env.PORT' as the port and 'process.env.IP' as the host in your scripts! debugger listening on port 15400 Failed to open socket on port 15400, waiting 1000 ms before retrying Failed to open socket on port 15400, waiting 1000 ms before retrying Failed to open socket on port 15400, waiting 1000 ms before retrying Failed to open socket on port 15400, waiting 1000 ms before retrying Failed to open socket on port 15400, waiting 1000 ms before retrying

Like this forever, this problem it's being sinnce the last week. I don't know what to do the C9.IO support people it's usless the dont have any idea...

I have reset the workspace, the account, i'm lost...