WRT54G: ONE specific domain suddenly unreachable

WRT54G has been working flawlessly since i bought it circa 2002. Suddenly, two days ago, ONE specific domain is unreachable. rest of the internet fine. unreachable via wired or wireless connections. windows/linux/iPad/Mac, all cannot reach this ONE domain (fairfield.edu) ...
i tried:
1. unplugging and restarting the cable modem (Optimum Online): didn't help.
2. rebooting the Linksys router: didnt help.
3. upgrading the firmware in the router: didn't help.
4. resetting factory defaults in the router: didn't help
traceroute shows timeouts always at the same point (optimum's lightpath), but Optimum has no advice.
i assume its the router, but cannot figure out what could have changed to make one (and only one) domain unreachable.
any advice? MANY thanks.

When you connect your computer directly to the Modem, on your computer open the command prompt window and type "ipconfig" and post the detail output in your next post.

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WRT54G: ONE specific domain suddenly unreachable

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