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

The error "OpenQA.Selenium.WebDriverException: Cannot start the driver service on http://localhost:PORT/" in Selenium for C# usually occurs when the GeckoDriver (Firefox's driver) executable cannot be located, is blocked by system settings, or is incompatible with the installed browser version. Core Reasons for This Error

// Point to the folder containing geckodriver.exe var service = FirefoxDriverService.CreateDefaultService(@"C:\Path\To\Your\Driver\Folder"); var driver = new FirefoxDriver(service); Use code with caution. Copied to clipboard The error "OpenQA

Java (Selenium 4):

6. Alternative: Using WebDriver Manager (No PATH Hassle)

The most reliable way to avoid the "cannot start driver service" error is to let a manager handle binaries. Run with elevated rights if needed (Windows: Run

Run with elevated rights if needed (Windows: Run as Administrator).

For headless or CI environments:

Or perhaps you are seeing:

driver = webdriver.Firefox(service=service, options=options) is blocked by system settings