Cannot Start The Driver Service On Http Localhost Selenium Firefox C ((top)) -

service = Service(executable_path='path/to/geckodriver', port=7055) # Classic Selenium port driver = webdriver.Firefox(service=service)

Sometimes another application is using the port Selenium wants.

Before diving into solutions, it's important to understand what's happening behind the scenes. When you instantiate a FirefoxDriver in your C# test:

If a previous automation session crashed or closed improperly, a zombie geckodriver process might still be clinging to the communication port. Open ( Ctrl + Shift + Esc ). Open ( Ctrl + Shift + Esc )

from pyvirtualdisplay import Display display = Display(visible=0, size=(1920, 1080)) display.start() # Your Firefox driver code here

: Manually define a longer timeout in your FirefoxDriver constructor. A 60-second timeout is often recommended for stability. Incorrect File Paths :

Using a manually downloaded geckodriver.exe often leads to version mismatches or path resolution issues. The industry standard for modern .NET testing is to automate driver management using the WebDriverManager NuGet package. Incorrect File Paths : Using a manually downloaded

If you haven't added the driver directory to your system's PATH, you must tell the FirefoxDriver exactly where it is located.

from selenium.webdriver.firefox.options import Options

If another process is using Selenium's chosen port, assign a random free port to the service. 127.0.0.1 . 5.

Sometimes, local proxy settings interfere with Selenium's ability to communicate with localhost . Open . Add a new variable named NO_PROXY . Set the value to localhost,127.0.0.1 . 5. Check Output Directory (bin)

c# - 'Cannot start the driver service on http://localhost:60681/'

Add this line before initializing your FirefoxDriver: