I tried everything, disabling the router's SPI firewall, disabling Windows private and public firewalls, creating a new inbound rule in Windows Firewall, enabling DMZ. Port forwarding refuses to work.
The machine is running Windows 8 x64, AT&T provided Motorola ADSL modem, Linksys WRT54GL (stock firmware).
This is a AT&T business account with dynamic IP.
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