ERROR [ ]: System.Net.Sockets.SocketException: No such host is known
  at System.Net.Dns.GetHostByName (System.String hostName) [0x00000]
  at System.Net.Dns.GetHostEntry (System.String hostNameOrAddress) [0x00000]
  at System.Net.Dns.GetHostAddresses (System.String hostNameOrAddress) [0x00000]
  at OpenSim.Framework.SimpleRegionInfo.get_ExternalEndPoint () [0x00000]
  at OpenSim.Region.Environment.Scenes.SceneCommunicationService.EnableNeighbourChildAgents (OpenSim.Region.Environment.Scenes.ScenePresence avatar) [0x00000]
  at OpenSim.Region.Environment.Scenes.Scene.InformClientOfNeighbours (OpenSim.Region.Environment.Scenes.ScenePresence presence) [0x00000]
  at OpenSim.Region.Environment.Scenes.ScenePresence.SendInitialData () [0x00000]
  at (wrapper delegate-invoke) System.MulticastDelegate:invoke_void ()
  at OpenSim.Region.ClientStack.ClientView.ProcessInPacket (libsecondlife.Packets.Packet Pack) [0x00000]
  at OpenSim.Region.ClientStack.ClientView.ClientLoop () [0x00000]
  at OpenSim.Region.ClientStack.ClientView.AuthUser () [0x00000]
  at (wrapper delegate-invoke) System.MulticastDelegate:invoke_void ()