Cannot Start The Driver Service On Http Localhost Selenium Firefox C |best|

If none of the above helps, please share:

Incompatibility between Firefox, GeckoDriver, and Selenium versions.

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. If none of the above helps, please share:

If a previous automated test run crashed unexpectedly, the geckodriver.exe process might still be running hidden in the background. This locks the communication ports. To clear these out: Open on Windows.

from selenium import webdriver from selenium.webdriver.firefox.service import Service If a previous automated test run crashed unexpectedly,

using OpenQA.Selenium; using OpenQA.Selenium.Firefox;

: Spawning too many simultaneous parallel test tasks can exhaust system resources, making GeckoDriver take longer than 2 seconds to initialize. from selenium import webdriver from selenium

– Your user cannot execute geckodriver or bind to ports.

Running into OpenQA.Selenium.WebDriverException: 'Cannot start the driver service on http://localhost:XXXXX/' while using and C# ? This usually means the driver service failed to launch or your code is misconfigured. Here are the most effective ways to fix it: 1. Kill Lingering Processes