Port 오픈 확인

Assuming that it's a TCP (rather than UDP) port that you're trying to use:

1. On the server itself, use netstat -an to check to see which ports are listening

2. From outside, just telnet host port (or telnet host:port on Unix systems) to see if the connection is refused, accepted, or timeouts

On that latter test, then in general:

• connection refused means that nothing is running on that port
• accepted means that something is running on that port
• timeout means that a firewall is blocking access

출처 : http://stackoverflow.com/questions/273159/how-to-determine-if-a-port-is-open-on-a-windows-server

 

 

방화벽설정시 포트 오픈 확인하는 방법중 하나인 텔넷 접속방법이 있다.

 - 텔넷 접속시 유의할점

 

* 텔넷 연결시 포트를 사용중인 프로그램이 있지 않으면 접속이 되지 않는다.