ipv6 Connect() to 'ns.exitgames.com' () failed:

Hi. I am using latest Unity 5.4.0p1 and latest PUN 1.7.3 free but when i try to connect via ipv6 only network i get this error.

Connect() to 'ns.exitgames.com' () failed: System.Net.Sockets.SocketException: No such host is known
at System.Net.Dns.hostent_to_IPHostEntry (System.String h_name, System.String[] h_aliases, System.String[] h_addrlist) [0x00000] in :0
at System.Net.Dns.GetHostByName (System.String hostName) [0x00000] in :0
at System.Net.Dns.GetHostEntry (System.String hostNameOrAddress) [0x00000] in :0
at ExitGames.Client.Photon.IPhotonSocket.GetIpAddress (System.String serverIp) [0x00000] in :0
at ExitGames.Client.Photon.SocketUdp.DnsAndConnect () [0x00000] in :0