I have a question about scanning.
When ever I scan with nmap, I get results that all ports are filtered.
I scaned more than 100 IP adresses and didn't found 1 open port. Thees adresses wasn't from some security specialists, but from ordinary people usually running xp sp2 (most of them not updated) and windows 2003 server.

So this ports are filtered because thy are behind firewall.
But what to do now ???? How to bypass this ?
When ever I see this tutorials, thy all find open ports, but this is very hard to find.

So what to do now, you can't attack filtered ports with exploits, or do you ?