If by hub, you mean your wireless network (router), there is most likely one of two reasons. It may be possible that you are utilizing the incorrect security protocol, or that your router is not configured to communicate with the Wii 802.11 standards configuration.
In both scenarios you will need to dig into your router's configuration setup. Some of today's routers have this integrated into a program right on your PC or Mac. However, most router configurations are done via web browser. The specific IP or your router may vary from others. You can find it in your manual, or another good resource is www.portforward.com.
There you can find a variety of different network improvement walkthroughs, but more importantly in your case you can find the specific IP(s) of your router, and also the original administrative credentials.
Once you have accessed the configuration you will need to find out what specific security protocol your network is using (the default on newer routers is generally WPA2 Personal). If it is not WPA2, you will need to manually configure your Wii's connections settings to reflect the correct protocol (the Wii's default is WPA). In this case and the next you will need to make the correct selections going through the manual connection process.
The latter scenario is much more probable if you are working with a newer 802.11ac compatible router or even more recent 802.11n dual band routers. From your router's wireless configuration menu you will need to verify that the wireless mode is setup to communicate with 802.11b and/or 802.11g (these are the two utilized by the Wii itself). Some of the more recent routers (especially ac models) may not be configured to work with the older IEEE standards. The newer routers may be configured to communicate with one, the other, or both 802.11n and 802.11ac. You will need to ensure that your wireless network is working with the legacy standards.
In all likelihood, correcting one of the these two things will enable your network to speak with the Wii. Good luck.