Read my post under the Cubase iC Pro official tutorial. You might be running into what I am running into.
Regarding the news that you allowed Cubase through your Win7 Firewall, in reading about Wi-Fi connection, it becomes clear that you can disengage the first Firewall in Win7 (there are two Firewalls) without any ill consequence. This would automatically allow your Home Network access to Cubase. You can leave the second Firewall up - the one that deals with the internet - but even that one is reported by some to not be necessary. Eh, I leave my second one up anyway.
If you read my post, you will learn that I am running into having to run the Home Network Diagnostic tool in order to establish connection from my Home Network to Cubase via the Ski software. Win7 does not want to easily move between the two different networks I have setup. Try what I suggest, do what you are doing and then run the Network diagnostic tool.