https://me.yahoo.com/a/jo5q4xs30.5qydkrdhowxjqw8epzee4_#842fa created the issue

I have a MacBook running Snow Leopard (OS 10.6.5). My wireless network is encrypted. In trying to start an ftp session using Cyberduck, I have managed to cripple Airport, and have not been able to reset, or reconfigure, back to the starting point. Airport shows wireless connection to the router, but no program (not Cyberduck, not Mail, not Firefox) can talk to the Airport software within my MacBook. I mistakenly selected PPPoe rather than DHCP in the first attempt. I downloaded only an SFTP configuration, and may have tried to run up using FTP. I have run through the entire setup again citing DHCP, but it does not help. At this point, I am on an Ethernet cable, but Airport remains unusable.

I hope you have seen this and have a known fix. I have Time Machine saves, so could reload a module if I knew which one.