Cannot Start The Driver Service On Http Localhost Selenium Firefox C _top_ Jun 2026

Can you share the message from your debugger? Share public link

The exception OpenQA.Selenium.WebDriverException: 'Cannot start the driver service on http://localhost:[port]/' is a frustrating roadblock for C# automation engineers. It happens right at initialization when . Because the local HTTP server wrapper for the driver cannot boot up, Selenium halts before your code even reaches the browser. Can you share the message from your debugger

You can kill these processes via the Windows Command Prompt: taskkill /F /IM geckodriver.exe /T Use code with caution. Because the local HTTP server wrapper for the

– geckodriver, Selenium, and Firefox versions incompatible. using OpenQA

using OpenQA.Selenium; using OpenQA.Selenium.Firefox; public class FirefoxSetup public static void Main() // Define services and options var service = FirefoxDriverService.CreateDefaultService(); service.HideCommandPromptWindow = true; // Hides the console window var options = new FirefoxOptions(); // Uncomment if you need to set a specific path // options.BrowserExecutableLocation = @"C:\Program Files\Mozilla Firefox\firefox.exe"; try using (var driver = new FirefoxDriver(service, options)) driver.Navigate().GoToUrl("https://google.com"); Console.WriteLine(driver.Title); driver.Quit(); catch (Exception ex) Console.WriteLine("Error: " + ex.Message); 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

For detailed setup instructions, you can refer to the official Selenium documentation .