Simply i can't connect to every minecraft server stuck on pinging.... forever

I CANT CONNECT TO EVERY MINECRAFT SERVEr. it will stuck on pinging... forever and i know i configured my pc firewall to allow 25565 port but why im getting this error on over 7 minecraft servers?!? whats going on??
is there a problem with my modem's firewall? if someone knows whats the problem please comment for me. PLEASE HELP.