Cannot Start The Driver Service On Http Localhost Selenium Firefox C [better] < SECURE >

Consider using a WebDriver management library to handle driver downloads and updates automatically. These tools eliminate version compatibility issues by automatically providing the correct driver for your Firefox version:

Open your package manager console in Visual Studio and ensure Selenium.WebDriver and Selenium.WebDriver.GeckoDriver (if you use the auto-installer package) are updated to their latest versions.

Here’s a structured troubleshooting guide for that issue.

The browser may appear to launch, and then after roughly 60 seconds of stalling, Selenium throws this exception. Consider using a WebDriver management library to handle

If you haven't already, you need to install the specific Selenium wrapper for Firefox.

c# - 'Cannot start the driver service on http://localhost:60681/'

Is this error happening on your or inside a CI/CD build pipeline (like Azure DevOps or GitHub Actions)? Share public link The browser may appear to launch, and then

Happy testing — and may your driver services always start on the first try.

using (var driver = new FirefoxDriver())

If the error persists, try running your test without a proxy connection first to isolate the issue. Share public link Happy testing — and may

Another process is using the default port assigned to GeckoDriver.

| Component | Role | |-----------|------| | | Your Python/Java/C# script sending commands (e.g., driver.get("https://google.com") ) | | GeckoDriver | A separate executable that translates Selenium commands into Marionette protocol (Firefox’s internal automation protocol) | | Firefox Browser | The actual browser that executes the commands |

It waits (usually up to 2 seconds by default in .NET bindings) for the driver to respond.

Since GeckoDriver starts a local web server to communicate with your code, firewalls might flag it as "unauthorized network activity." Temporarily disable your firewall to test.