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

Technical Incident Report: Selenium WebDriver Initialization Error

When you see "Cannot start the driver service," it implies one of three things: Windows (Command Prompt as Admin): netstat -ano |

executable cannot initialize its local HTTP server. This is often due to environment mismatches, blocked ports, or incorrect code implementation. Stack Overflow Common Fixes 1. Kill Orphaned Driver Processes If previous test runs crashed, "zombie" geckodriver.exe processes might still be running and locking the port. Stack Overflow Command Prompt as Administrator. Run the following command: taskkill /f /im geckodriver.exe 2. Verify Geckodriver Version and Architecture If it works, add an exception for geckodriver

Run a minimal script (Python example):

• Windows (Command Prompt as Admin):
  netstat -ano | findstr :4444
taskkill /PID <PID> /F
• macOS/Linux:
  lsof -i :4444
kill -9 <PID>

If it works, add an exception for geckodriver.exe in your Windows Defender or Antivirus settings. 4. Clean Up Hanging Processes If it works