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

acts as a lightweight local HTTP server (the "driver service"). It bridges the gap between generic WebDriver API commands and Firefox.

If Firefox itself is not installed properly, geckodriver can’t start.

chmod +x /path/to/geckodriver

c# - 'Cannot start the driver service on http://localhost:60681/' acts as a lightweight local HTTP server (the

By default, Selenium tries to bind to localhost . If your local machine configuration maps localhost to an IPv6 address ( ::1 ) while the driver expects IPv4 ( 127.0.0.1 ), the service initialization will fail.

Exception mentions "Address already in use" or "Failed to bind to port" . Sometimes the port number is explicitly 4444 .

Set the timeout to at least 60 seconds.

You can kill these processes via the Windows Command Prompt: taskkill /F /IM geckodriver.exe /T Use code with caution.

If you have tried all the above solutions and the error persists, consider these additional steps:

When running Selenium on a (Linux without a GUI, or Docker container), GeckoDriver attempts to create a graphical display. If it fails, the entire service crashes with the localhost error. chmod +x /path/to/geckodriver c# - 'Cannot start the

FirefoxDriverService service = FirefoxDriverService.CreateDefaultService(); var options = new FirefoxOptions(); // Increase timeout to 120 seconds for slower environments var driver = new FirefoxDriver(service, options, TimeSpan.FromSeconds(120));

using OpenQA.Selenium; using OpenQA.Selenium.Firefox; class Program static void Main(string[] args) // Create a default service instance FirefoxDriverService service = FirefoxDriverService.CreateDefaultService(); // Force the service to bind explicitly to the IPv4 address service.Host = "127.0.0.1"; // Optional: Hide the command prompt window to prevent clutter service.HideCommandPromptWindow = true; // Initialize the driver with the configured service using (IWebDriver driver = new FirefoxDriver(service)) driver.Navigate().GoToUrl("https://google.com"); Console.WriteLine(driver.Title); Use code with caution. 2. Kill Zombie GeckoDriver Processes

import io.github.bonigarcia.wdm.WebDriverManager; Sometimes the port number is explicitly 4444

The error message "Cannot start the driver service on http://localhost" in Selenium (C#) usually occurs when the GeckoDriver