Nothing seems to happen beyond the FB pop up modal

On dineout-indy.com, things seem to work. I was properly brought to the Login / Register page of JFBConnect, which means that authentication has worked.

However, on do-indy.com, I get an error message from Facebook that the URL is not correct for your FB Application. A Facebook App can only work on one domain, so you won't be able to use the same application across both of those sites. It's generally not recommended to have 2 domains for the same URL anyways as that's really bad for SEO, branding, and other purposes. I'd recommend redirecting one of those to the other and using one application. Otherwise, you'll need to setup 2 different application and use a different one on each site (meaning that users will have to approve both applications).

I hope that helps, but if you need anything else, let us know,
Alex

If do-indy.com is a redirect, it's not the correct kind as the URL isn't changing. You should setup a 301 redirect which will permanently redirect the user to the correct domain and update the URL in the address bar.

Right now, Google, Facebook or any other site will see do-indy.com and dineout-indy.com as 2 completely separate websites with identical content across each, which is widely considered to be a very bad thing.

I hope that explains a bit more,
Alex