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

Then instantiate your driver without any additional driver packages:

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. Then instantiate your driver without any additional driver

The system cannot find the geckodriver.exe file. 1. Match Your Versions catch (Exception ex) Console.WriteLine($"Error: ex.Message")

If you're behind a corporate proxy, set the NO_PROXY environment variable to exclude localhost and 127.0.0.1 from proxy routing. Then instantiate your driver without any additional driver