Linuxmad, I don't know which configuration you used for your Censornet setup, but I presume you used the gateway/firewall option.
If you did make use of this method, you'll need to create an IPtables rule that will allow your server traffic through - in fact, thinking about it now, I remember vaguely there is actually a setting within the webgui that gives you the option to bypass authentication and allow ALL internet access, its based on MAC addresses, which you mentioned you had to add manually. I believe that should solve it for you.
Else I would advise you to use the 'sideways' proxy option as described on the censornet site. But that will force you to have fierce proxy setup on your clients, but it is still the way I prefer to use it, together with a .pac file on my webserver for easy bypass/changes if needed in emergency.
Hope that helps
