First of all, there is a typo in your rule. It must be
ipfw add deny ip from 192.168.0.2 to www.uol.com.br
But I assume you know it. What's more important is that a rule added this way becomes the *last* rule in the list and therefore is processed latest. There is a rule in default WIPFW configuration:
add allow ip from any to any out keep-state
This rule allows any...
2009-09-13 14:51:07 UTC in wipfw