[newbie] Ping doesn't respond

[g]

II installed PMFirewall and then tried to ping AT&T but it stalled?

PING www.att.com (192.20.3.54): 56 octets data 

and it just sits there.  I can access the internet but I can't ping.  I 
didn't change any of the settings in LinxConf because this is a standalone 
pc.  Any idea what I am doing wrong?