Maveric,
I don't think your issue is related to the above. The error message you see is a sign that the DNS lookups on your server aren't working as they should. You'd need to contact your hosting provider/technical support and ask them to make sure that your site can do DNS lookups and make outgoing requests to other servers. Communication to Facebook's servers happens over a number of URLs, including graph.facebook.com.
I hope that helps, but if you need more information, just let us know. This is not an issue with JFBConnect specifically though.
Thanks,
Alex