Cannot Start The Driver Service On Http Localhost Selenium Firefox C Extra Quality Jun 2026

To verify your Firefox version: Open Firefox → Menu → Help → About Firefox.

service = Service(executable_path='geckodriver', port=7056)

service = Service('/usr/local/bin/geckodriver')

Ensure you have the latest ⁠geckodriver for your operating system. To verify your Firefox version: Open Firefox →

Then, initialize your driver utilizing the automatic setup tool:

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

driver.get("https://www.google.com") driver.quit() Common Fixes driver

Understanding the Error The error occurs when the Selenium WebDriver framework fails to launch or establish a network connection with the local browser driver executable. In the context of C# and Firefox, this means your .NET application cannot successfully run or communicate with geckodriver.exe .

Old geckodriver may not support your Firefox version.

Ensure Firefox is updated to the latest stable release. 3. Configure Firewall Exceptions Ensure Firefox is updated to the latest stable release

Alternatively, run this in CMD (admin): taskkill /F /IM geckodriver.exe /T .

OpenQA.Selenium.WebDriverException: 'Cannot start the driver service on http://localhost:xxxxx/'

Add a system environment variable NO_PROXY with the value localhost ⁠0.5.1 . 3. Kill Existing GeckoDriver Processes

Edit: Have added some more information about error and steps been taken to solve. Please let me add if need more information add.