Using the PID from lsof or netstat:
kill -9 <PID> # Linux/macOS
taskkill /PID <PID> /F # Windows
By definition, localhost is not accessible from other machines. This makes localhost11501 inherently safe from external attacks—as long as you don’t purposefully expose it.
Look for configuration files (.env, config.yml, settings.py) containing 11501. Change it to another port like 11502 and restart the service. localhost11501
This is the most critical piece of information. If something is listening on 11501, you need to know what it is.
Windows (PowerShell):
Get-NetTCPConnection -LocalPort 11501
Linux / macOS:
sudo lsof -i :11501
On Linux, edit /etc/services and add myapp 11501/tcp. On Windows, edit C:\Windows\System32\drivers\etc\services (requires admin). This prevents other apps from claiming it without notice. Using the PID from lsof or netstat :
Not inherently. However, any open port can be a vector if an exploitable service is listening. Always verify unknown listeners.
If you want to free up localhost11501 or reassign it, follow these methods. By definition, localhost is not accessible from other