Can someone help me Regarding the Security History entries

I checked my NIS 2009 security history and I'm confused about a few things. I have four entries that say:

 

Rule  "Default block UPnP discover" stealthed (169.254.135.120, port ssdp(1900) ).

Inbound UDP Packet

Local Adress, service is (239.255.255.250, Port (1900) )

Remote Adress, service is (169.254.235.120, Port (63704) )

Process name is "C:\WINDOWS\ system32\svchost.exe".

 

 

Norton doesn't say it's a risk or anything. in the "Severity" column it says "info". And in status it says "detected".

 

Can someone help me figure out what this is all about?

 

<<edit: subject edited for more clarity>>

Message Edited by JerryM on 11-11-2009 12:30 PM