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

If it works, add an exception for geckodriver.exe in your Windows Defender or Antivirus settings. 4. Clean Up Hanging Processes

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. If it works, add an exception for geckodriver

The error is a common headache for C# developers using Selenium with Firefox. It typically means the GeckoDriver executable is unable to establish a local network connection to start its internal server. 🛠️ Root Causes Port Conflicts: Another process is using the default port. Loopback Issues: localhost isn't resolving to 127.0.0.1 . The error is a common headache for C#

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 Loopback Issues: localhost isn't resolving to 127

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