열린 포트 확인

https://zetawiki.com/wiki/%EB%A6%AC%EB%88%85%EC%8A%A4_%EB%A1%9C%EC%BB%AC%EC%84%9C%EB%B2%84_%EC%97%B4%EB%A6%B0_%ED%8F%AC%ED%8A%B8_%ED%99%95%EC%9D%B8

# netstat -tnlp

# nmap localhost