Newtear, from what I remember is an old DoS (Denial of Service) attack. There have been newer reports involving M$FT’s Media Player which seems to be effected. This usually occurs if you are using McAfee’s Firewall product. You are actually getting a false positive (there actually is NO attack.)
The problem is that some software firewalls and Intrusion Detection Systems don't handle UDP data properly, including streaming media files.
Try checking the web site of the firewall (or M$FT) provider. With any luck they’ll have some solutions. You can always try switching to another product such as Zone Alarm.
Kilo