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

Ensure you aren't running an old version of GeckoDriver with a brand-new version of Firefox.

Right-click your project -> Manage NuGet Packages -> Update Selenium.WebDriver and Selenium.WebDriver.GeckoDriver . Ensure you aren't running an old version of

The error is a common headache for C# developers using Selenium with Firefox. It typically means the GeckoDriver executable is unable to establish a local network connection to start its internal server. 🛠️ Root Causes Port Conflicts: Another process is using the default port. Loopback Issues: localhost isn't resolving to 127.0.0.1 . Ensure you aren't running an old version of