Cannot Start The Driver Service On Http Localhost Selenium Firefox C Official

process or cannot establish a connection to it within the expected timeout.

: Cannot start the driver service on http://localhost:4444/ process or cannot establish a connection to it

If you have multiple failed runs, background processes may still be bound to ports or consuming resources, preventing new services from starting. Stack Overflow Open a terminal as Administrator and run: taskkill /f /im geckodriver.exe taskkill /f /im firefox.exe Use code with caution. Copied to clipboard Ensure you always call driver.Quit() block to prevent this in the future. Stack Overflow 3. Check Proxy and Localhost Settings process or cannot establish a connection to it