Adding my 2 cents. For a series of situations I use to have 2 ADSL providers. After switching to the second one I suddenly wasn't able to load LOTRO (loader stuck on pre-req) and neither reach the lotro.com website from any of my devices in the network. This, after reading different posts, let me come to the the conclusion that the public IP I was assigned was blocked. I then shut off the router and turned it on after 30 seconds. Now I'm connected with a new IP and everything works again.