If all ports are showing up as stealthed, then yes, with Zonealarm as long as the firewall is set to the ‘high’ settings all ports will be stealthed.

The ‘attempts’ to access your PC will mostly be ‘background traffic’ (other people using the internet) which is nothing to worry about, and the ones from your ISP will properly be legitimate, but nothing bad can come from it blocked or unblocked.

Make sense?

–lee