Question
smtp/transport being filtered in private networking
Hello,
I have a couple droplets in nyc2, and one of them is running postfix. However, if I try to connect to both ports 25 and 587 from another droplet through the private network interface, the connection times out. Nmap shows those ports ate being filtered (not by me though):
$ nmap XXX.XXX.XXX.XXX -p 25,587
Starting Nmap 6.46 ( http://nmap.org ) at 2014-08-22 14:26 UTC
Nmap scan report for XXX.XXX.XXX.XXX
Host is up (0.00044s latency).
PORT STATE SERVICE
25/tcp filtered smtp
587/tcp filtered submission
Nmap done: 1 IP address (1 host up) scanned in 1.26 seconds
Postfix is listening correctly:
# lsof -i tcp:25
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
master 4873 root 12u IPv4 11491 0t0 TCP *:smtp (LISTEN)
master 4873 root 13u IPv6 11492 0t0 TCP *:smtp (LISTEN)
Just to be sure, I set postfix to listen in port 23, and was able to successfully connect:
$ telnet XXX.XXX.XXX.XXX
Trying XXX.XXX.XXX.XXX...
Connected to XXX.XXX.XXX.XXX.
Escape character is '^]'.
220 Polibra ESMTP Postfix
^]
telnet> q
Connection closed.
Is that normal behavior?
Thanks
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