Can not get version of Oracle via nmap.

[<kim700620 () yahoo co jp>]

Hello,
   
  I'm trying to discover Oracle11gR2 using Nmap.
and can not get the version of it.
The following is my environment.
   
  Nmap version: 5.51
OS: Windows Server 2003 SP2/Windows XP professional
Target DB1: Oracle11gR1 on Windows Server 2008 SP1
Target DB2: Oracle11gR2 on Windows Server 2008 R2
Command: nmap -sV -p 1521 <IP address>
   
  And the result of my scan is:
[Target DB1]
Nmap scan report for <IP address>
  Host is up (0.00s latency).
  PORT     STATE SERVICE    VERSION
  1521/tcp open  oracle-tns Oracle TNS Listener 11.1.0.7.0 (for 32-bit Windows)
  MAC Address: **:**:**:**:**:** (Microsoft)
  [Target DB2]
Nmap scan report for <IP address>
  Host is up (0.00s latency).
  PORT     STATE SERVICE    VERSION
  1521/tcp open  oracle-tns Oracle TNS Listener
  MAC Address: **:**:**:**:**:** (Microsoft)
   
  Both of the database service and listener are running and I can connect to the database from a remote machine.
  I wonder if this is a bug. 
  Or if not, is there any other setting I should to do?
   
  Thanks in advance.
   
                                                  &nbsp; Yours sencially.
                                                  &nbsp; Melanie Kim
 
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