Open your Command Prompt (Windows) as an administrator and run: netstat -ano | findstr 8001 Use code with caution.
: Use the Command Prompt (as Admin) to find what is using the port: netstat -aof | findstr :8001 This will show a Process ID (PID) . You can then use taskkill /F /PID [number] to stop that process. Check Common Culprits : Users have reported that services sometimes reserve this port for internal use. Firewall Settings Cisco Packet Tracer is allowed through your Windows Security Firewall Bypass with Login Workaround cisco packet tracer port 8001
computer, as certain corporate network restrictions might require specific IT approval to unblock these ports? Open your Command Prompt (Windows) as an administrator