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

var driverPath = @"C:\drivers\geckodriver"; // full folder path containing geckodriver.exe var service = FirefoxDriverService.CreateDefaultService(driverPath); service.HideCommandPromptWindow = true; service.Port = 0; // let system pick an open port

Partial downloads, corrupted binaries, or broken Firefox profiles. If your machine has strict proxy settings, it

// Point to the folder containing geckodriver.exe var service = FirefoxDriverService.CreateDefaultService(@"C:\PathToDriverFolder\"); // Optional: Define a specific port if localhost is congested service.BrowserCommunicationPort = 2828; var options = new FirefoxOptions(); // Optional: If Firefox isn't in a standard location options.BinaryLocation = @"C:\Program Files\Mozilla Firefox\firefox.exe"; // Use a longer timeout (e.g., 60 seconds) to prevent service start errors using (var driver = new FirefoxDriver(service, options, TimeSpan.FromSeconds(60))) driver.Navigate().GoToUrl("https://www.google.com"); Use code with caution. Copied to clipboard var driverPath = @"C:\drivers\geckodriver"

Selenium needs to talk to the driver service on a local port. If your machine has strict proxy settings, it might try to route this internal traffic through an external proxy and fail. Add localhost to your NO_PROXY environment variables. service.HideCommandPromptWindow = true