Firewall question...

[crowland2]

I have cable internet and network my computers using a router. I also run Zone Alarm. I went to a website that had a "Leak Test" and it said my firewall was working. Here's my question(s). My Zone Alarm gives this alert: The firewall has blocked Internet access to your computer (UDP Port xxxx) from xx.xx.xx.x (DNS). I went a couple of weeks without getting one alert, and now I'm getting tons in one hour from the same DNS, but a different port. What exactly are they trying to do? Why is the same dns coming up? It's like they're locked into my computer and keep trying to get in. Is there something I can do to throw them off?

I know I'm pretty ignorant about this, but that's why I'm here. Enlighten me! Thanks!!

Oh yeah...is there a way to look up who this is?? Just curious. Thanks!!