I get the same message (but different protocol) when two clients on my LAN are configured to do IPv6 through a tunnel and only one of them can really use the tunnel. But this is just an ordinary UDP connection.
Do the messages disappear when you turn off ALG?
Demonized, you have me here. I don't even know if I have clients configured on my LAN. I do have the WindowsXP IPv6 TCP/IP loading along with the "regular" TCP/IP. ALG was an acronym I was not familiar with so had I to go and look it up. sheesh. I looked at my ALG service and saw that it was not running so I immediately started it and saw that there was no change. Then I re-read your post and noticed that you said "OFF". So, it looks like having ALG On or Off makes no difference.
Lizzi, thank you for your input. I do not know if the boxes are UPnP enabled or not. I did have IP addresses assigned to each of them so I unassigned them, checked the logs and the messages are still coming in. Every minute or so. Tons of them. Millions of them. BILLIONS of tons of them. A GAZILLIO..... never mind. After I unassigned the addresses I noticed that one of them had lost the name I assigned to it so I now had a device connected that only displayed an IP address. I compared the MAC address to my list of allowed devices, saw that was a cable box, removed that MAC address from the Allowed list and now I get a Log message that says: Access denied to LAN system with MAC address 0019A662ABCC. This is the MAC address I removed so it confirmed that these messages are being created by my Set Top Boxes.
Verizon is now pushing a new "Feature" that will allow you to program your DVR through the Internet. I have yet to allow Verizon to add me to their list. I wonder if all of these constant attempts to call home are a product of this new service they're offering. I will be replacing a defective STB soon and after I do and I see that they are all playing nice and the home service can see them and run it's little diagnostic, I'll probably bite the bullet and let them add this service to my DVR's. Once that is done, I'll see if I still get these status messages. In the mean time, if anyone else, or you Demonized, or you, Lizzi, have any other ideas I'm all thumbs, er, I mean ears.