Detected unexpected data in protocol

I occasionally get the following in my firewall logs:

11/05/2012 16:31:42 Detected unexpected data in protocol 192.168.0.6:11128 77.67.32.160 UDP

Typically there will be a burst of these logs, spanning a minute or so. They appear every few weeks. The remote IP seems to be something to do with Skype, which I have running by default, but I don't know or understand why it would produce this result.

 

It might help to enable special logging and attach the log to a support request with our customer care department. You can also take a look at these logs to possibly help your narrow down the cause for these entries.

 

Instead of the mentioned log, capture the network communication using Wireshark and supply it to Customer care along with a SysInspector log.