Port 8000, PID 4, not able to kill, taskill /f /pid 4, Access Denied

This error message indicates that the process with Process ID (PID) 4 could not be terminated due to lack of permission. PID 4 refers to the "System" process in Windows operating system, which is a crucial component of the system and controls many important functions.

To terminate the System process, you will need to have administrative privileges or run the command prompt as an administrator. Follow these steps:

1. Press the Windows key + R to open the Run dialog box.

2. Type "cmd" in the Run dialog box and press Ctrl + Shift + Enter. This will open the Command Prompt with administrative privileges.

3. In the Command Prompt, type "taskkill /f /pid 4" and press Enter. The "/f" flag will force terminate the process, and "/pid 4" will target the System process with PID 4.

4. If you receive the message "Access is denied," try opening the Command Prompt with the "Run as administrator" option and run the command again.

Note that terminating the System process can cause system instability and may result in data loss or other unexpected behavior. You should only terminate this process if you know what you are doing and have a good reason for doing so.

Note: If you're in Windows this might help you, the port 80 is usually being used by this service: "World Wide Web Publishing Service", open "Services" in the Control Panel and stop it