SCAN UPnP service discover attempt

[Mark Williamson <snortuser () nunswithguns co uk>]

Greetings,

  There are two hosts on this network that every 5 seconds or so cause 
snort to alert

          [**] [1:1917:4] SCAN UPnP service discover attempt [**]
          [Classification: Detection of a Network Scan] [Priority: 3]
           ...........


each alert is repeated 3 times from each host to the same destination 
(the gateway router on this network)

Both of the hosts are running Windows XP and Snort is running on 
Slackware 9.0.0

I see on the snort.org site what this is SID:1917 - but the part that 
troubles me is the False Positive and False Negative sections -

      False Positives: A scanner may be used in a security audit.
      False Negatives: None Known.

If this is the case why am i seeing these hosts "ticking" like this?
Any help on this matter would be much appreciated, I've rtfm and googled 
and checked the mail archive yet i find no answers to my quandry.

Thanks again,

Mark



-------------------------------------------------------
This SF.net email is sponsored by:  Etnus, makers of TotalView, The best
thread debugger on the planet. Designed with thread debugging features
you've never dreamed of, try TotalView 6 free at www.etnus.com.
_______________________________________________
Snort-users mailing list
Snort-users () lists sourceforge net
Go to this URL to change user options or unsubscribe:
https://lists.sourceforge.net/lists/listinfo/snort-users
Snort-users list archive:
http://www.geocrawler.com/redir-sf.php3?list=snort-users