Getting a 404 on /wd/hub/session when I try to connect to selenium grid remotely via Python
Question: I can see two remotes under the console but when I try to connect remotely and
execute something it fails with a 404.

    
    
    from selenium import webdriver
    browser = webdriver.Remote(
       command_executor='http://ec2-184-72-129-183.compute-1.amazonaws.com:4444/wd/hub',
       desired_capabilities={'browserName': 'firefox'})
    browser.get('http://www.google.com')
    browser.quit()
    

Throws this exception

    
    
    Traceback (most recent call last):
      File "browser-shot.py", line 16, in <module>
        desired_capabilities={'browserName': 'firefox'})
      File "/usr/local/lib/python2.6/dist-packages/selenium/webdriver/remote/webdriver.py", line 62, in __init__
        self.start_session(desired_capabilities, browser_profile)
      File "/usr/local/lib/python2.6/dist-packages/selenium/webdriver/remote/webdriver.py", line 104, in start_session
        'desiredCapabilities': desired_capabilities,
      File "/usr/local/lib/python2.6/dist-packages/selenium/webdriver/remote/webdriver.py", line 155, in execute
        self.error_handler.check_response(response)
      File "/usr/local/lib/python2.6/dist-packages/selenium/webdriver/remote/errorhandler.py", line 125, in check_response
        raise exception_class(value)
    selenium.common.exceptions.WebDriverException: Message: '<html>\n<head>\n<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"/>\n<title>Error 404 </title>\n</head>\n<body><h2>HTTP ERROR: 404</h2><pre>NOT_FOUND</pre>\n<p>RequestURI=/wd/hub/session</p><p><i><small><a href="http://jetty.mortbay.org/">Powered by Jetty://</a></small></i></p><br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n<br/>                                                \n\n</body>\n</html>\n' 
    


Answer: This doesn't appear to be a python error. It seems like the machine you have
your selenium server on is refusing requests. In the error message, you have
an `<a href="http://jetty.mortbay.org/">Powered by Jetty://</a>` which got me
thinking that it is somehow related to Jetty.

I don't know much about Jetty, but you might want to look there for your
answers. One possible problem is that Jetty is also running on port 4444, but
I can't say for sure, because I don't know how Jetty works.

EDIT

I should also add that I tried your setup on my local machine, to one of my
servers (that doesn't have Jetty on it) and it worked perfectly fine.

