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

Ensure Firefox is updated to the latest stable release. 3. Configure Firewall Exceptions

To prevent this error in the future, always wrap your driver initialization in a try-catch block and ensure you call driver.Quit() in a finally block or a using statement. Ensure Firefox is updated to the latest stable release

Since GeckoDriver starts a local web server to communicate with your code, firewalls might flag it as "unauthorized network activity." Temporarily disable your firewall to test. Since GeckoDriver starts a local web server to

using (IWebDriver driver = new FirefoxDriver()) { try { driver.Navigate().GoToUrl("https://google.com"); } catch (Exception ex) { Console.WriteLine($"Error: {ex.Message}"); } } // Automatically calls Quit() and closes the service Use code with caution. 🔍 Troubleshooting Summary Ensure port 4444 (or your custom port) is free. Path Verify geckodriver.exe is in your bin folder. VPN Turn off VPNs, as they can sometimes reroute local traffic. Permissions Run Visual Studio as Administrator. Path Verify geckodriver

var driverService = FirefoxDriverService.CreateDefaultService(); driverService.Host = "127.0.0.1"; // Force IPv4 IWebDriver driver = new FirefoxDriver(driverService); Use code with caution. 2. Update Drivers and Browser

Right-click your project -> Manage NuGet Packages -> Update Selenium.WebDriver and Selenium.WebDriver.GeckoDriver .