driver = webdriver.Remote(command_executor=
    'http://usename:key@hub.browserstack.com:80/wd/hub',
    desired_capabilities=desired_cap)
driver.get(
    'http://httpwatch:password1@www.httpwatch.com/httpgallery/authentication/authenticatedimage/default.aspx?0.7349707232788205'
    )
How to use the IE webdriver from selenium for python (Failed to navigate error)?