Comment 10 for bug 1491290

More information :
Using local IP address : Works
Using domain name : Works
Using public IP address : Error

Warning: System.Net.Sockets.SocketException: Hôte inconnu (=> Unknown host)
   at System.Net.Dns.GetAddrInfo(String name)
   at System.Net.Dns.InternalGetHostByAddress(IPAddress address, Boolean includeIPv6, Boolean throwOnFailure)
   at System.Net.Dns.GetHostEntry(String hostNameOrAddress)
   at ORTS.MultiPlayer.ClientComm..ctor(String serverIP, Int32 serverPort, String s) in e:\Documents\Coding\Jenkins\jobs\Open Rails Unstable\workspace\Source\RunActivity\MultiPlayer\ClientComm.cs:line 51
   at ORTS.Processes.GameStateRunActivity.InitSimulator(UserSettings settings, String[] args, String mode, String acttype) in e:\Documents\Coding\Jenkins\jobs\Open Rails Unstable\workspace\Source\RunActivity\Processes\GameStateRunActivity.cs:line 946
   at ORTS.Processes.GameStateRunActivity.Start(UserSettings settings, String acttype, String[] args) in e:\Documents\Coding\Jenkins\jobs\Open Rails Unstable\workspace\Source\RunActivity\Processes\GameStateRunActivity.cs:line 274
   at ORTS.Processes.GameStateRunActivity.<>c__DisplayClass8.<Load>b__3() in e:\Documents\Coding\Jenkins\jobs\Open Rails Unstable\workspace\Source\RunActivity\Processes\GameStateRunActivity.cs:line 149
   at ORTS.Processes.GameStateRunActivity.Load() in e:\Documents\Coding\Jenkins\jobs\Open Rails Unstable\workspace\Source\RunActivity\Processes\GameStateRunActivity.cs:line 189
   at ORTS.Processes.LoaderProcess.Load() in e:\Documents\Coding\Jenkins\jobs\Open Rails Unstable\workspace\Source\RunActivity\Processes\LoaderProcess.cs:line 155
   at ORTS.Processes.LoaderProcess.DoLoad() in e:\Documents\Coding\Jenkins\jobs\Open Rails Unstable\workspace\Source\RunActivity\Processes\LoaderProcess.cs:line 136
   at ORTS.Processes.LoaderProcess.LoaderThread() in e:\Documents\Coding\Jenkins\jobs\Open Rails Unstable\workspace\Source\RunActivity\Processes\LoaderProcess.cs:line 107
   at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ThreadHelper.ThreadStart()

Connection error - will play in single mode.