netcat이 포트 4444에서 수신 대기하려고하지만 작동하지 않는 것 같습니다. nmap을 사용하여 포트가 열려 있는지 확인하고 있지만 포트를 선택하지 않아 이유를 알 수 없습니다. 나는 기쁨없이 다양한 항구를 시도했습니다.

여기 내 터미널의 사본이 있으므로 내가하고있는 일과 시도한 것을 볼 수 있습니다.

#iptables -L

Chain INPUT (policy ACCEPT)
target     prot opt source               destination

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination


# nmap localhost -p 4444

Starting Nmap 5.61TEST4 ( http://nmap.org ) at 2012-07-31 16:37 BST
Nmap scan report for localhost (127.0.0.1)
Host is up (0.00019s latency).
Other addresses for localhost (not scanned): 127.0.0.1
PORT     STATE  SERVICE
4444/tcp closed krb524

Nmap done: 1 IP address (1 host up) scanned in 0.10 seconds


# nc -l 4444 &
[1] 1951


# nmap  localhost -p 1-65535

Starting Nmap 5.61TEST4 ( http://nmap.org ) at 2012-07-31 16:42 BST
Nmap scan report for localhost (127.0.0.1)
Host is up (0.0000070s latency).
Other addresses for localhost (not scanned): 127.0.0.1
Not shown: 65532 closed ports
PORT      STATE SERVICE
22/tcp    open  ssh
7337/tcp  open  unknown
33507/tcp open  unknown

Nmap done: 1 IP address (1 host up) scanned in 1.37 seconds


# ps -e | grep nc
   12 ?        00:00:00 sync_supers
 1156 tty1     00:00:00 ck-launch-sessi
 1232 tty1     00:00:00 dbus-launch
 1274 ?        00:00:00 klauncher
 1951 pts/2    00:00:00 nc

답변

4444: inverse host lookup failed: Unknown server error : Connection timed out`
listening on [any] 41579 ...`

listening on [any] 4444 ...