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WebDriverException on invoking webdriver.Remote("http://localhost:4444/wd/hub", webdriver.DesiredCapabilities.CHROME) through Selenium and Python

I'm pretty sure this'll be a head smacker, but I've followed ever bit of doc I can find and I can't get rid of this error. I'm in the process of setting up a Selenium Grid (in Docker) and can get tests to run only if I don't specify the remote. Here's the code

def setUp(self):
    self.browser = webdriver.Remote("http://localhost:4444/wd/hub", webdriver.DesiredCapabilities.CHROME)
FWIW, this works fine, but isn't useful in a grid environment without the command_executor:
def setUp(self):
    self.browser = webdriver.Chrome()
Based on a number of sources, including https://hackr.io/blog/complete-guide-selenium-webdriver, the call to the RemoteWebDriver should be correct.
Here's the error:
ERROR: test_hackernews_search_for_selenium (__main__.HackerNewsSearchTest)
Traceback (most recent call last):
  File "test.py", line 16, in setUp
    self.browser = webdriver.Remote("http://localhost:4444/wd/hub", webdriver.DesiredCapabilities.CHROME)
  File "/usr/local/lib/python2.7/site-packages/selenium/webdriver/remote/webdriver.py", line 157, in __init__
    self.start_session(capabilities, browser_profile)
  File "/usr/local/lib/python2.7/site-packages/selenium/webdriver/remote/webdriver.py", line 252, in start_session
    response = self.execute(Command.NEW_SESSION, parameters)
  File "/usr/local/lib/python2.7/site-packages/selenium/webdriver/remote/webdriver.py", line 321, in execute
    self.error_handler.check_response(response)
  File "/usr/local/lib/python2.7/site-packages/selenium/webdriver/remote/errorhandler.py", line 242, in check_response
    raise exception_class(message, screen, stacktrace)
WebDriverException: Message: None
                Thanks for responding.  I'm not completely sure what the difference was, but I found if I created the nodes with docker-compose, everything sorted itself out.
– reknab
                Apr 30, 2019 at 12:13
This error message...
ERROR: test_hackernews_search_for_selenium (__main__.HackerNewsSearchTest)
Traceback (most recent call last):
  File "test.py", line 16, in setUp
    self.browser = webdriver.Remote("http://localhost:4444/wd/hub", webdriver.DesiredCapabilities.CHROME)
WebDriverException: Message: None
...implies that the client program was unable to initiate a new WebBrowsing Session i.e. Chrome Browser session.
Your main issue is the connectivity between the Selenium Grid Hub and Selenium Grid Node.
Solution
Ensure the following:
The Selenium Grid Hub is initiated successfully.
The Selenium Grid Node is initiated and provisioned successfully within the Selenium Grid Hub
                I suspect you're probably correct.  I set up the grid by hand first.  I think that docker-compose eliminated any mistake I might have made.
– reknab
                Apr 30, 2019 at 19:05
        
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