nmap not working properly...showing ports as filtered, but ncat banner grab works

["Joseph McCray" <joe () strategicsec com>]

Building a box right now. Any IP that I scan comes back as ports being
filtered, but ncat allows me to bannergrab the host. 

 

Never seen that before. It does this for any port on any IP - ncat
bannergrab works, but not a portscan. Any ideas?

 

root@shrek:~# ncat 69.163.181.91 22     <-- This works fine

SSH-2.0-OpenSSH_5.1p1 Debian-5

 

root@shrek:~# nmap -PN -sV -p 22 69.163.181.91             <-- This doesn't
work - always shows filtered

 

PORT   STATE    SERVICE

22/tcp filtered ssh

 

Nmap done: 1 IP address (1 host up) scanned in 2.10 seconds

 

 

 

Below is my system info:

---------------------------------

 

root@shrek:~# cat /etc/issue

Ubuntu 11.04 \n \l

 

root@shrek:~# uname -a

Linux shrek.xxxxxxxxx.xxx 2.6.18-028stab095.1 #1 SMP Mon Oct 24 20:15:15 MSD
2011 i686 i686 i386 GNU/Linux

 

 

root@shrek:~# nmap -V

 

Nmap version 5.21 ( http://nmap.org )

 

 

root@shrek:~# dpkg --get-selections | grep pcap

libpcap0.8                                      install

 

 

root@shrek:~# /sbin/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

 

 

 

 

 

Joe McCray

 

Toll Free:             1-866-892-2132            

Email:                 joe () strategicsec com

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Website:               http://strategicsec.com

 

 

 

When NASA began the launch of astronauts into space, they found out that

the pens wouldn't work at zero gravity (ink won't flow down to the

writing surface). To solve this problem, it took them one decade and $12

million. They developed a pen that worked at zero gravity, upside down,

underwater, in practically any surface including crystal and in a

temperature range from below freezing to over 300 degrees C. 

 

And what did the Russians do...?? They used a pencil.

 

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