Our lobby server is currently suffering a major DDOS attack. We are working our hardest on it. Will keep everyone updated as we try find some solutions.
Please direct connect to community servers IP addresses for now. Sorry about this inconvenience.
Please view this guide on how to connect to community servers via direct IP, as well, if you host your own server, this guide will explain how to share your IP with the community so they can connect to it -
http://steamcommunity.com//sharedfiles/filedetails/?id=416763878
You can find community server ip's if the server operator lists them publically, the forums is a good place to check.
There is a list of servers that can be connected too here, and on the forums:
http://reign-of-kings.net/
EDIT - We were able to get the lobby server back up for time being. Sorry if there is still some slowdown retrieving listings, we are working on it.