diff --git a/Dakota/Models/DakotaException.cs b/Dakota/Models/DakotaException.cs
index f5f1fd759..accbee113 100644
--- a/Dakota/Models/DakotaException.cs
+++ b/Dakota/Models/DakotaException.cs
@@ -10,7 +10,7 @@ namespace Dakota.Models
     public class DakotaException : ArgumentException
     {
         public string Title { get; set; }
-        public new string Message { get; set; }
+        public override string Message { get; }
 
         public DakotaException(string message, string title) : this(message)
         {
diff --git a/Host/GkvAbrechnungView.aspx.cs b/Host/GkvAbrechnungView.aspx.cs
index 92ef9718f..29840075b 100644
--- a/Host/GkvAbrechnungView.aspx.cs
+++ b/Host/GkvAbrechnungView.aspx.cs
@@ -141,7 +141,7 @@ namespace Host
             }
 
             var server = GetServerFromTenant(gkv_request.Tenant);
-            var loginurl = string.Format(LOGINSERVER_URL, server);
+            var loginurl = string.Format(LOGINSERVER_URL, $"https://{server}/service");
 
 #if DEBUG
             //loginurl = string.Format(LOGINSERVER_URL, "https://app4.bewoplaner.de");
@@ -166,7 +166,7 @@ namespace Host
             }
             catch (Exception e)
             {
-
+                throw new DakotaException($"loginurl: {loginurl} | " + e.ToString());
             }
 
             return successful;