I followed youtube video [https://www.youtube.com/watch?v=utYZaVe9Nd0]for setting up eclipse maven sdk 2.1 project, I am using Luna eclipse, and followed video step by step, but when I create remote repository and give URL mention in video eclipse says "Remote catalog is empty"
Have you tried pinging and tracert that url to see if its a firewall issue? If you can reach it then I think its something for the alfresco guys to look at.