After reading through the post this morning, I found one listener posted the exact warning message which was what I suspect when I first saw this topic...
Norton Internet Worm Protection has detected & blocked an intrusion attempt.
intrusion: Invalid Destination Port
intruder: MYCOMPUTER (220.127.116.11)
risk level: medium
source IP address: (18.104.22.168)
destination IP address: (*mine)
UDP source: 8466
UDP destination port: 0. invalid
This is in bug that has been in Streamer for many versions now but is we think fixed in the version about to be released. It occurs when Streamer erroroneously tries to send a packet from port 8466 to port 0 on another computer running Streamer. IT is NOT a virus or a hack attempt. It's a small bug which until recently was being very elusive for the developer.
Any other symptoms that might have happened when this warning popped up is pure coincidence. If Streamer is not installed manually with a download and run, activeX component is designed to install Streamer in the users TEMP folder. This is what gives the listener a click and listen experience.
If you use the click and run activeX on XP or I think Windows 2k, you will find ALL of the files for Streamer have been put into c:\Documents and Settings\[user]\Local Settings\Temp\streamer.