diff --git a/Facepunch.Steamworks.Test/Server/Server.cs b/Facepunch.Steamworks.Test/Server/Server.cs
index 0d85f9c..88b568b 100644
--- a/Facepunch.Steamworks.Test/Server/Server.cs
+++ b/Facepunch.Steamworks.Test/Server/Server.cs
@@ -14,10 +14,52 @@ public class Server
         [TestMethod]
         public void Init()
         {
-            using ( var server = new Facepunch.Steamworks.Server( 252490, 0, 20216, 20816, 20817, false, "VersionString" ) )
+            using ( var server = new Facepunch.Steamworks.Server( 252490, 30000, 30001, 30002, 30003, false, "VersionString" ) )
             {
                 Assert.IsTrue( server.Valid );
             }
         }
+
+        [TestMethod]
+        public void AuthCallback()
+        {
+            using ( var client = new Facepunch.Steamworks.Client( 252490 ) )
+            {
+                Assert.IsTrue( client.Valid );
+
+                var ticket = client.Auth.GetAuthSessionTicket();
+                var ticketBinary = ticket.Data;
+
+                using ( var server = new Facepunch.Steamworks.Server( 252490, 30000, 30001, 30002, 30003, false, "VersionString" ) )
+                {
+                    Assert.IsTrue( server.Valid );
+
+                    for ( int i = 0; i < 16; i++ )
+                    {
+                        System.Threading.Thread.Sleep( 10 );
+                        server.Update();
+                        client.Update();
+                    }
+
+                    if ( !server.Auth.StartSession( ticketBinary, client.SteamId ) )
+                    {
+                        Assert.Fail( "Start Session returned false" );
+                    }
+
+                    for( int i = 0; i<16; i++ )
+                    {
+                        System.Threading.Thread.Sleep( 10 );
+                        server.Update();
+                        client.Update();
+                    }
+
+                    //
+                    // Client cancels ticket
+                    //
+                    ticket.Cancel();
+
+                }
+            }
+        }
     }
 }
diff --git a/Facepunch.Steamworks/Facepunch.Steamworks.csproj b/Facepunch.Steamworks/Facepunch.Steamworks.csproj
index d70f83a..c9738ce 100644
--- a/Facepunch.Steamworks/Facepunch.Steamworks.csproj
+++ b/Facepunch.Steamworks/Facepunch.Steamworks.csproj
@@ -132,10 +132,9 @@
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="Interop\steam_api_interop.cs" />
     <Compile Include="Server.cs" />
+    <Compile Include="Server\Auth.cs" />
   </ItemGroup>
-  <ItemGroup>
-    <Folder Include="Server\" />
-  </ItemGroup>
+  <ItemGroup />
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <PropertyGroup>
     <PostBuildEvent>
diff --git a/Facepunch.Steamworks/Server.cs b/Facepunch.Steamworks/Server.cs
index b99976b..ae130a3 100644
--- a/Facepunch.Steamworks/Server.cs
+++ b/Facepunch.Steamworks/Server.cs
@@ -101,12 +101,7 @@ public enum MessageType : int
 
         public Server( uint appId, uint IpAddress, ushort SteamPort, ushort GamePort, ushort QueryPort, bool Secure, string VersionString )
         {
-            if ( !Valve.Interop.NativeEntrypoints.Extended.SteamInternal_GameServer_Init( IpAddress, SteamPort, GamePort, QueryPort, Secure ? 3 : 2 , VersionString ) )
-            {
-                return;
-            }
-
-            //Valve.Steamworks.SteamAPI.Init( appId );
+            Valve.Interop.NativeEntrypoints.Extended.SteamInternal_GameServer_Init( IpAddress, SteamPort, GamePort, QueryPort, Secure ? 3 : 2, VersionString );
 
             native = new Internal();
 
diff --git a/Facepunch.Steamworks/Server/Auth.cs b/Facepunch.Steamworks/Server/Auth.cs
new file mode 100644
index 0000000..9eb74df
--- /dev/null
+++ b/Facepunch.Steamworks/Server/Auth.cs
@@ -0,0 +1,50 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace Facepunch.Steamworks
+{
+    public partial class Server
+    {
+        ServerAuth _auth;
+
+        public ServerAuth Auth
+        {
+            get
+            {
+                if ( _auth == null )
+                    _auth = new ServerAuth { server = this };
+
+                return _auth;
+            }
+        }
+    }
+
+    public class ServerAuth
+    {
+        internal Server server;
+
+        /// <summary>
+        /// Start authorizing a ticket
+        /// </summary>
+        public unsafe bool StartSession( byte[] data, ulong steamid )
+        {
+            fixed ( byte* p = data )
+            {
+                var result = (Valve.Steamworks.EBeginAuthSessionResult) server.native.gameServer.BeginAuthSession( (IntPtr)p, data.Length, steamid );
+
+                if ( result == Valve.Steamworks.EBeginAuthSessionResult.k_EBeginAuthSessionResultOK )
+                    return true;
+
+                return false;
+            }
+        }
+
+        public void EndSession( ulong steamid )
+        {
+            server.native.gameServer.EndAuthSession( steamid );
+        }
+
+    }
+}