I just changed the security level in my router from 1 to 2 ("Web, FTP, Telnet and TFTP traffic are blocked from the WAN to the LAN.". After doing that, I find that I can't do a ping to any external address; I get "Destination host unreachable" messages (though it does resolve the target name, at least).
What could be the trouble, and what the solution?
Operating System:Windows XP Home Edition
Product Name:ZoneAlarm (Free)