Index: Application/Ringtoets/src/Application.Ringtoets/App.xaml.cs
===================================================================
diff -u -ra730057358d8e79466fa4ff3d348a0230ee00858 -r7c2804202c19885449ea697da4a8f4b0220d30b9
--- Application/Ringtoets/src/Application.Ringtoets/App.xaml.cs	(.../App.xaml.cs)	(revision a730057358d8e79466fa4ff3d348a0230ee00858)
+++ Application/Ringtoets/src/Application.Ringtoets/App.xaml.cs	(.../App.xaml.cs)	(revision 7c2804202c19885449ea697da4a8f4b0220d30b9)
@@ -398,7 +398,10 @@
 
         private static string UserDisplay()
         {
-            return string.Format("{0} ({1})", UserPrincipal.Current.DisplayName, UserPrincipal.Current.SamAccountName);
+            return !Thread.CurrentPrincipal.Identity.IsAuthenticated
+                       ? Environment.UserName
+                       : string.Format("{0} ({1})", UserPrincipal.Current.DisplayName,
+                                       UserPrincipal.Current.SamAccountName);
         }
 
         private static string GetLogFileDirectory()
Index: Application/Ringtoets/test/Application.Ringtoets.Test/AppTest.cs
===================================================================
diff -u -ra730057358d8e79466fa4ff3d348a0230ee00858 -r7c2804202c19885449ea697da4a8f4b0220d30b9
--- Application/Ringtoets/test/Application.Ringtoets.Test/AppTest.cs	(.../AppTest.cs)	(revision a730057358d8e79466fa4ff3d348a0230ee00858)
+++ Application/Ringtoets/test/Application.Ringtoets.Test/AppTest.cs	(.../AppTest.cs)	(revision 7c2804202c19885449ea697da4a8f4b0220d30b9)
@@ -22,6 +22,7 @@
 using System;
 using System.DirectoryServices.AccountManagement;
 using System.Linq;
+using System.Threading;
 using Core.Common.Gui.Settings;
 using Core.Common.TestUtil;
 using NUnit.Framework;
@@ -75,8 +76,11 @@
                 };
 
                 // Assert
-                var userDisplayInfo = string.Format("{0} ({1})", UserPrincipal.Current.DisplayName,
-                                                    UserPrincipal.Current.SamAccountName);
+                var userDisplayInfo = !Thread.CurrentPrincipal.Identity.IsAuthenticated
+                                          ? Environment.UserName
+                                          : string.Format("{0} ({1})", UserPrincipal.Current.DisplayName,
+                                                          UserPrincipal.Current.SamAccountName);
+
                 TestHelper.AssertLogMessages(call, messages =>
                 {
                     var msgs = messages.ToArray();