OP, does the wireless connection device get an IP from the router DHCP? If it does, is it something straight forward like 192.168.0.10, or is it falling back to something more random looking? The former suggests the connection to the router is good, the later suggests the device is failing to pass the key check. Also, check that the connection device doesnt have statically allocated ip addresses. The number of times i have banged my head against a brick wall because i forget to change the device to 'get automatically'
I don't know anything about the home hubs, do they have some sort of 'allowed devices' list like netgear routers?