Protractor timeout on Jenkins with PhantomJS - angularjs

Question

I created a Jenkins job to run Protractor tests at midnight.
For headless testing, I'm using PhantomJS browser because I can't install Xvfb (don't have the rights).
I'm running the Protractor tests through a Grunt task.
On my local machine (windows), the grunt job works fine, and the tests pass.
On the server, I'm getting
Failed: waiting for page to load for 10000ms
...
Failed: Error while waiting for Protractor to sync with the page: "window.angular is undefined. This could be either because this is a non-angular page or because your test involves client-side navigation, which can interfere with Protractor's bootstrapping. See http://git.io/v4gXM for details"
My protractor-headless.conf:
exports.config = {
directConnect: false,
capabilities: {
browserName: 'phantomjs',
'phantomjs.binary.path': require('phantomjs').path,
'phantomjs.cli.args': []
},
seleniumServerJar: require('selenium-server-standalone-jar').path,
framework: 'jasmine2',
specs: [
'./e2e/**/**.spec.js'
],
allScriptsTimeout: 30000,
jasmineNodeOpts: {
showColors: true,
defaultTimeoutInterval: 200000,
isVerbose: true//,
//includeStackTrace : false
},
onPrepare: function() {
'use strict';
var jasmineReporters = require('jasmine-reporters');
jasmine.getEnv().addReporter(new jasmineReporters.JUnitXmlReporter({
consolidateAll: true,
savePath: 'test-results',
filePrefix: 'xmloutput'
}));
}
};
And the Grunt Job:
protractor: {
options: {
configFile: 'src/test/javascript/protractor.conf.js',
keepAlive: true,
noColor: false,
verbose: true,
args: {
// Arguments passed to the command
}
},
headless: {
options: {
keepAlive: false,
configFile: 'src/test/javascript/protractor-headless.conf.js'
}
}
}
...
grunt.registerTask('e2e-test-headless', [
'protractor:headless'
]);
The test have access to the testing environment.
Any idea what can be the problem?