I am trying to open port 3000 on Ubuntu 12.04, cause I have a web server listening there. I'm a bit out of my confort zone here, and spent many hours trying to solve the problem without success.
Port seems to be open in the firewall :
$> sudo ufw status
Status: active
To Action From
-- ------ ----
...
3000/tcp ALLOW Anywhere
3000/tcp ALLOW Anywhere (v6)
The server is listening alright on that port :
$> netstat -an | grep "LISTEN "
...
tcp 0 0 127.0.0.1:3000 0.0.0.0:* LISTEN
...
And I can even wget
alright the index page :
$> wget localhost:3000
Connecting to localhost (localhost)|127.0.0.1|:3000... connected.
HTTP request sent, awaiting response... 200 OK
And the received file contains what I expect ("hello world" :).
However, when trying from another computer, or if I wget mydomain.com:3000
I get "connection refused"
, and nmap tells me that the port is not open :
$> nmap -A -T4 mydomain.com
Host is up (0.00032s latency).
...
Not shown: 999 closed ports
PORT STATE SERVICE VERSION
22/tcp open ssh OpenSSH 5.9p1 Debian 5ubuntu1 (protocol 2.0)
...
Service Info: OS: Linux
Any idea what I should try next ???
EDIT
Here's what traceroute gives :
$> traceroute mydomain.com
traceroute to mydomain.com (176.31.x.x), 30 hops max, 60 byte packets
1 mydomain.com (176.31.x.x) 0.034 ms 0.013 ms 0.010 ms
traceroute mydomain.com
from the remote computer. You can ** out the last two octets of the last (server) IP for privacy.