I’m reviving in this old thread because I’m seeing a similar quirk and wish to know whats going on. Interestingly, these ports do not get shown as open when i scan from the DO machine itself to either it’s localhost or public interfaces.
[ *** From My Laptop *** ]
me@MyLaptop:~$ nmap -sV <My_DO_Server_HostName>
Starting Nmap 6.47 ( http://nmap.org ) at 2014-12-02 19:27 PST
Nmap scan report for <My_DO_Server_HostName> (<My_DO_Server_IP>)
Host is up (0.046s latency).
Not shown: 997 closed ports
PORT STATE SERVICE VERSION
21/tcp open tcpwrapped
554/tcp open tcpwrapped
7070/tcp open tcpwrapped
Service detection performed. Please report any incorrect results at http://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 7.14 seconds
me@MyLaptopr:~$ nc -v <My_DO_Server_HostName> 21
Connection to <My_DO_Server_HostName> 21 port [tcp/ftp] succeeded!
me@MyLaptop:~$ nc -v <My_DO_Server_HostName> 554
Connection to <My_DO_Server_HostName> 554 port [tcp/rtsp] succeeded!
me@MyLaptop:~$ nc -v <My_DO_Server_HostName> 7070
Connection to <My_DO_Server_HostName> 7070 port [tcp/arcp] succeeded!
[ *** On DO VM *** ]
me@MyDOVM:~$ sudo netstat -plant
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:<sshd port> 0.0.0.0:* LISTEN 4655/sshd
tcp 0 384 <DO VM IP>:<sshd port> <Laptop IP>:40251 ESTABLISHED 1391/sshd: <My user>
tcp6 0 0 :::<sshd port> :::* LISTEN 4655/sshd
Regards :)
