This is Mike from the Norton Authorized Support Team.
Can you please tell me which version of Norton 360 you have installed. You can determine this by opening Norton 360, choose "Help & Support->About."
You should also run Windows Update to make sure you have the latest critical patches from Microsoft installed as well.
This message indicates that the Norton Firewall is doing it's job by blocking an attack on your computer. Sometimes your ISP may notice a strange pattern of traffic coming from your PC and may send out a "sniffer" to determine what is going on. However, the fact that you are being redirected in your web browser and are being constantly warned of the intrusion attempt, leads me to believe that your computer is infected.
The latest version of Norton 360 is version 4.X. If by chance you are using version 3 and your subscription is valid, you are entitled to a free update to version 4 and we always recommend that our customers have the latest version installed, so that you are protected against the latest threats. If you need to update, please visit the Norton Update Center.Norton Update Center
If you already have version 4 installed, manually run LiveUpdate, possibly multiple times, until you are informed there are no more updates available. Next, restart your computer into Windows Safe Mode, launch Norton 360 and complete a "Comprehensive System Scan" to check for threats.
Let me know if any threats were found, and if so, the name(s) and weather or not Norton 360 was able to remove them.
I have Windows XP Pro and Norton 360. Frequently as soon as I plug into "online" the 360 window comes up to say "A recent attempt to attack your computer was blocked". When I look att eh details, the sending IP addresses are different. My browser is often directed to a site totally different than one I was trying to reach. My DVD burner is not working correctly and I don't know if this virus is also the cause of this malfunction.