I'm a newbie also, but I had the same symptoms. The problem I had was I configured shorewall, then updated my system via MCC, and it overwrote the config file for shorewall. So I could connect, but not ping anything (or telnet or ftp, etc...). It was because my firewall (shorewall) wasn't letting me. Have you done any automatic updates lately, so maybe a config file got reset? Are you using shorewall? If so, check /etc/shorewall/shorewall.conf. If you turn off your firewall, does your internet connection work okay? If so, it's not a firewall issue (or at least not the firewall you think). Wish I could be more help.
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