nmap root vs user question

[ToddAndMargo <ToddAndMargo () zoho com>]

Hi All,

"#" is my "root" prompt and "$" is my user prompt.

Question: why does namp sometimes work as root
and not as a user?  Why no warning that a command
has to be run as root?


This works as root:
     # nmap -p T:5020,5900 192.168.202.210
     Starting Nmap 6.40 ( http://nmap.org ) at 2013-10-04 14:25 PDT
     Nmap scan report for 192.168.202.210
     Host is up (0.00063s latency).
     PORT     STATE    SERVICE
     5020/tcp filtered zenginkyo-1
     5900/tcp filtered vnc

Same command does not work as a user:
     $ nmap  -p T:5020,5900 192.168.202.210
     Starting Nmap 6.40 ( http://nmap.org ) at 2013-10-04 14:25 PDT
     Note: Host seems down. If it is really up, but blocking our
           ping probes, try -Pn


Many thanks,
-T

--
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Computers are like air conditioners.
They malfunction when you open windows
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