[unisog] Messenger port 1900 to my router

Steve Bernard sbernard at gmu.edu
Thu Jan 15 20:35:18 GMT 2004

You can disable this on Windows XP by changing a registry key. A value of
'2' turns off the multicast traffic.

Key: HKLM\Software\Microsoft\DirectPlayNATHelp\DPNHUPnP
Value: 2


Steve Bernard
George Mason University
Fairfax, Virginia

-----Original Message-----
From: Mayne, Jim [mailto:J.Mayne at tcu.edu]
Sent: Thursday, January 15, 2004 9:03 AM
To: unisog at sans.org
Subject: [unisog] Messenger port 1900 to my router

I am not very familiar with the Messenger protocol but I am seeing a
constant traffic from my windows machines to port 1900 of my routers
internal interfaces. It is always the default gateway address of the windows
machines. From what I could tell Messenger should be sending to a multicast
address not the unicast address of the gateway. Is something going on here?



Jim Mayne
Network Security Engineer
Texas Christian University
j.mayne at tcu.edu
(817) 257-6843

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