subdomain – How to make my sub-domain forwarding survive links?

I have my sub-domain forwarding to I have installed the site-wide navbar on the blog. When visiting the blog through the sub-domain, when clicking on the mysite/forum (FluxxBB) link in the navbar, an error message is displayed “ refused to connect.” This forum link otherwise works when clicked from anywhere else, including directly from Just not from

I’ve tried looking at the admin settings of the Forum, and the Cpanel/godaddy admin for the sub-domain, but I can’t identify the source of this problem.