Slug

Are you connecting via a router? What encryption (if any) is being used? Any other security layers in place such as a firewall, access control lists etc? Are IP addresses allocated via DHCP or are you using static IPs?

From your brief description it sounds as if the device can't route data. The first thing I would check is that the Hero has a correct IP address. In "Wireless Controls/Wi-fi Settings" tap the connection and ensure that the listed IP address corresponds to the same subnet as your router.