Ini hasil pemeriksaan di server anda:
[root@mail ~]# lsof -i :443
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
httpd 14143 root 6u IPv6 19424 0t0 TCP *:https (LISTEN)
httpd 14148 apache 6u IPv6 19424 0t0 TCP *:https (LISTEN)
httpd 14149 apache 6u IPv6 19424 0t0 TCP *:https (LISTEN)
httpd 14150 apache 6u IPv6 19424 0t0 TCP *:https (LISTEN)
httpd 14153 apache 6u IPv6 19424 0t0 TCP *:https (LISTEN)
httpd 14154 apache 6u IPv6 19424 0t0 TCP *:https (LISTEN)
httpd 14155 apache 6u IPv6 19424 0t0 TCP *:https (LISTEN)
httpd 14174 apache 6u IPv6 19424 0t0 TCP *:https (LISTEN)
[root@mail ~]# lsof -i :7778
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
kloxo-hia 14427 lxlabs 3u IPv4 20512 0t0 TCP *:interwise (LISTEN)
[root@mail ~]# ps aux|grep iptables
root 14773 0.0 0.0 103316 840 pts/0 S+ 04:45 0:00 grep iptables
[root@mail ~]# lsof -i :21
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
pure-ftpd 14633 root 4u IPv4 20751 0t0 TCP *:ftp (LISTEN)
pure-ftpd 14633 root 5u IPv6 20753 0t0 TCP *:ftp (LISTEN)
[root@mail ~]# lsof -i :80
[root@mail ~]# lsof -i :7777
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
kloxo-hia 14427 lxlabs 4u IPv4 20513 0t0 TCP *:cbt (LISTEN)
Tapi ini hasil ketika saya coba telnet dari server saya ke server anda (ip saya ganti):
[root@oln4 ~]# telnet 111.112.113.114 22
Trying 111.112.113.114...
Connected to 111.112.113.114.
Escape character is '^]'.
SSH-2.0-OpenSSH_5.3
^C^]
telnet> quit
Connection closed.
[root@oln4 ~]# telnet 111.112.113.114 7778
Trying 111.112.113.114...
telnet: connect to address 111.112.113.114: No route to host
[root@oln4 ~]# telnet 111.112.113.114 7777
Trying 111.112.113.114...
telnet: connect to address 111.112.113.114: No route to host
[root@oln4 ~]# telnet 111.112.113.114 21
Trying 111.112.113.114...
telnet: connect to address 111.112.113.114: No route to host
[root@oln4 ~]# telnet 111.112.113.114 80
Trying 111.112.113.114...
telnet: connect to address 111.112.113.114: No route to host
[root@oln4 ~]# telnet 111.112.113.114 53
Trying 111.112.113.114...
telnet: connect to address 111.112.113.114: No route to host
KESIMPULAN: hanya port 22 (SSH) yang terbuka (bisa diakses dari luar) di server anda!.