Cannot Start The Driver Service On Http Localhost Selenium Firefox C [verified] ⚡

It sounds like you’re running into the error:

Ensure your application has write permissions to the execution directory. Version Mismatch It sounds like you’re running into the error:

import io.github.bonigarcia.wdm.WebDriverManager;

Reason 4: Insufficient Permissions (Windows/Mac/Linux)


Symptoms:

The error might hide behind "Cannot start service: Access is denied" or the driver fails to execute. Open Windows Security → Firewall & network protection


    

  1. Open Windows Security → Firewall & network protection → Allow an app through firewall.
    2. 

  2. Click Change settings → Allow another app.
    3. 

  3. Browse to your geckodriver.exe and add it.
    4. 

  4. Ensure both "Private" and "Public" are checked (for localhost only, public is safe).
    5. 



The error "Cannot start the driver service on http://localhost" typically occurs when Selenium's C# bindings attempt to launch the GeckoDriver executable but fail to establish a communication channel on the local loopback address. 1. Root Cause Analysis The error "Cannot start the driver service on