Error 403 when lanching Firefox

[hikker]

Hello, i'm french so excuse me for my bad english.
I use selenium server 2.25 standalone in localhost.
When i execute SampleTest.php (phpunit SampleTest.php) i have encountered a problem on the line $this->driver = WebDriver_Driver::InitAtLocal("4444", "firefox");
Then, i had the error in the commande line : "this URI is forbidden or only accessible only by authentified users." .
When i manually launch firefox and copy the URI http://localhost:4444/wd/hub, i read with Firebug the same error "NetworkError: 403 Forbidden+for+Proxy - http://localhost:4444/wd/third_party/closure/goog/base.js"
Could you hepl me please.
thanks