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

This approach has been confirmed to resolve proxy-related driver service failures.

When automated tests crash or are force-closed, the background geckodriver.exe or firefox.exe instances often continue running in the background. These zombie processes lock the localhost ports that a new test execution requires, causing the driver service to immediately fail on startup.

Ensure your firewall isn't blocking geckodriver.exe from communicating over localhost. 5. Clean Temporary Files

temporarily (Chrome or Edge) to determine if the issue is Firefox-specific or stems from a broader environment problem This approach has been confirmed to resolve proxy-related

Security software is blocking the driver's execution.

Download the specific bit version ( win64 vs win32 ) of geckodriver that precisely matches the bit version of your Firefox installation.

c# - 'Cannot start the driver service on http://localhost:60681/' Ensure your firewall isn't blocking geckodriver

def test_firefox(): driver = webdriver.Firefox(executable_path="/usr/local/bin/geckodriver") driver.get("http://localhost") driver.quit()

driver.get('https://www.google.com') print(driver.title) driver.quit()

from selenium import webdriver from webdriver_manager.firefox import GeckoDriverManager Download the specific bit version ( win64 vs

to isolate environmental factors

: A strict corporate VPN, a misconfigured local proxy, or an altered hosts file can block processes from binding to localhost or 127.0.0.1 .

The error "" in Selenium C# typically occurs when the geckodriver executable fails to launch or communicate within the expected timeframe. Common Fixes

Selenium typically only tolerates the immediate previous version—significant version gaps will cause the driver service to fail.