Merge branch 'master' of github.com:coolmay/whpc-linux-communicator

LinuxCommunicator/LinuxCommunicator.cs

@@ -489,7 +489,7 @@ namespace Microsoft.Hpc.Communicators.LinuxCommunicator
 
         private string GetCallbackUri(string nodeName, string action)
         {
-            return string.Format("{0}/api/{1}/{2}", string.Format(CultureInfo.InvariantCulture, this.server.LinuxCommunicatorUriTemplate, Environment.MachineName), nodeName, action);
+            return string.Format("{0}/api/{1}/{2}", string.Format(CultureInfo.InvariantCulture, this.server.LinuxCommunicatorUriTemplate, this.headNodeFqdn.Value), nodeName, action);
         }
 
         public void OnRegisterRequested(RegisterEventArgs registerEventArgs)