Cannot Start The Driver Service On Http Localhost Selenium Firefox C [upd] Here

This comprehensive troubleshooting guide breaks down the core structural, environmental, and network issues causing this error in C# applications and provides actionable step-by-step fixes. 🛠️ Core Technical Causes

Have another strange Selenium error? Let me know in the comments! or vice versa.

This error frequently appears in CI/CD environments where test agents lack proper configuration. Here are targeted solutions for pipeline environments: or vice versa.

How to Fix Selenium Error: "Cannot start the driver service on http://localhost" with Firefox in C# or vice versa.

System.setProperty("webdriver.gecko.driver", "/path/to/geckodriver"); DesiredCapabilities capabilities = DesiredCapabilities.firefox(); WebDriver driver = new RemoteWebDriver(new URL("http://localhost:port"), capabilities);

Set the Variable name to NO_PROXY and the Variable value to localhost,127.0.0.1 .

: Ensure you aren't trying to run a 64-bit driver on a 32-bit OS, or vice versa.