I can't connect to 1 certain website.

I have a home network with an Time Capsule connected to the ISP's DSL modem and I connect 4 macs, and 2 iPads and an iPhone when not on 3G. Everything is running Lion or the latest iOS.

Last week I was able to connect to a website and easily go through their shopping catalog. Suddenly on Monday the page wouldn't load in Safari. The address bar would get blue about 1/2 way then I would get the error 'can't connect' Same problem using Chrome. I get the same problem not matter which computer I use from my network.

I talked to the business and they said the site was up and they don't block ISPs or IPs. My ISP is at a loss as they can also connect to the site.(plus they are not Apple friendly) I can connect to the site with my iPhone on 3G. I can connect to the site from my neighbour's network. If I connect my MBP to the modem with an ethernet cable the site loads.

I reset my Time Capsule to factory defaults and started from scratch but I still can't get that site to load, it just hangs. I'm sure that it has something to do with my router but I can't seem to nail it down.

Has anyone every seen this problem before?