I have Kaspersky Internet Security 2013, and today it started giving me a fit. It won't let any traffic inbound, and only a little outbound. This happened just after it did one of its many daily updates. I didn't do anything to change any of the settings, they are all set for default. I temporary disabled KAV, and I was able to surf the web, but once I started it, I lost Internet connection. It couldn't even find my satellite modem.