I'm trying to get netcat to listen on port 4444, but it doesn't seem to be working. I am checking to see if the port is open using nmap, but it doesn't pick it up and I can't figure out why. I have tried various ports with no joy.
Here is a copy of my terminal so you can see what I am doing and what I have tried:
#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