Due to the recent retail patch, a client update is required to sync with the server. The current client version required to connect is now 30161103_1. If you have not already done so, please update your client by following the guide here.
There was an issue with NPC's recently in the last update that has now been patched. Once I patch the new NPC listings, I will update the server version for the clients to connect. You should be able to connect later today.