Cannot Start The Driver Service On Http Localhost Selenium Firefox C

// Initialize the driver with the service IWebDriver driver = new FirefoxDriver(service);

// Method 1: Let Selenium automatically find geckodriver from PATH var driver = new FirefoxDriver();

Sometimes, if you stop debugging abruptly, the geckodriver.exe process stays running in the background. When you try to run the code again, it tries to bind to the same localhost port, fails, and throws this error.

using OpenQA.Selenium; using OpenQA.Selenium.Firefox;

Alternatively, run this command in your Developer PowerShell or Command Prompt to forcefully kill the processes:

OpenQA.Selenium.WebDriverException: 'Cannot start the driver service on http://localhost:XXXXX/' Use code with caution.

The system may not be able to find the driver, or it lacks permission to execute it. Stack Overflow to install Selenium.WebDriver.GeckoDriver . Ensure the property "Copy to Output Directory" geckodriver.exe "Copy if newer" Avoid running code from network/shared drives , as this can trigger permission errors. Google Groups 5. Binding Timeout

public void Dispose()

service = Service(GeckoDriverManager().install()) driver = webdriver.Firefox(service=service) driver.get("https://www.selenium.dev") print(driver.title) driver.quit()