Request Timed Out

[Den1al]

When trying to get request a url I get this weird message:
The request for http://my.domain.com:1234/ timed out
Although for 100% the site is online at that exact port on the exact page.

Any Suggestions?

EDIT:
This is my code:

phantom.test.root = "http://my.domain.com:1234";

phantom.test.add("MyTest", function() {

    this.get("/", function() {
        this.succeed();
    });

});