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diff --git a/OpenSim/Services/HypergridService/UserAgentService.cs b/OpenSim/Services/HypergridService/UserAgentService.cs
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+++ b/OpenSim/Services/HypergridService/UserAgentService.cs
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+/*
+ * Copyright (c) Contributors, http://opensimulator.org/
+ * See CONTRIBUTORS.TXT for a full list of copyright holders.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of the OpenSimulator Project nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+using System;
+using System.Collections.Generic;
+using System.Net;
+using System.Reflection;
+
+using OpenSim.Framework;
+using OpenSim.Services.Connectors.Hypergrid;
+using OpenSim.Services.Interfaces;
+using GridRegion = OpenSim.Services.Interfaces.GridRegion;
+using OpenSim.Server.Base;
+
+using OpenMetaverse;
+using log4net;
+using Nini.Config;
+
+namespace OpenSim.Services.HypergridService
+{
+    /// <summary>
+    /// This service is for HG1.5 only, to make up for the fact that clients don't
+    /// keep any private information in themselves, and that their 'home service'
+    /// needs to do it for them.
+    /// Once we have better clients, this shouldn't be needed.
+    /// </summary>
+    public class UserAgentService : IUserAgentService
+    {
+        private static readonly ILog m_log =
+                LogManager.GetLogger(
+                MethodBase.GetCurrentMethod().DeclaringType);
+
+        // This will need to go into a DB table
+        static Dictionary<UUID, TravelingAgentInfo> m_TravelingAgents = new Dictionary<UUID, TravelingAgentInfo>();
+
+        static bool m_Initialized = false;
+
+        protected static IGridUserService m_GridUserService;
+        protected static IGridService m_GridService;
+        protected static GatekeeperServiceConnector m_GatekeeperConnector;
+
+        public UserAgentService(IConfigSource config)
+        {
+            if (!m_Initialized)
+            {
+                m_log.DebugFormat("[HOME USERS SECURITY]: Starting...");
+                
+                IConfig serverConfig = config.Configs["UserAgentService"];
+                if (serverConfig == null)
+                    throw new Exception(String.Format("No section UserAgentService in config file"));
+
+                string gridService = serverConfig.GetString("GridService", String.Empty);
+                string gridUserService = serverConfig.GetString("GridUserService", String.Empty);
+
+                if (gridService == string.Empty || gridUserService == string.Empty)
+                    throw new Exception(String.Format("Incomplete specifications, UserAgent Service cannot function."));
+
+                Object[] args = new Object[] { config };
+                m_GridService = ServerUtils.LoadPlugin<IGridService>(gridService, args);
+                m_GridUserService = ServerUtils.LoadPlugin<IGridUserService>(gridUserService, args);
+                m_GatekeeperConnector = new GatekeeperServiceConnector();
+
+                m_Initialized = true;
+            }
+        }
+
+        public GridRegion GetHomeRegion(UUID userID, out Vector3 position, out Vector3 lookAt)
+        {
+            position = new Vector3(128, 128, 0); lookAt = Vector3.UnitY;
+
+            m_log.DebugFormat("[USER AGENT SERVICE]: Request to get home region of user {0}", userID);
+
+            GridRegion home = null;
+            GridUserInfo uinfo = m_GridUserService.GetGridUserInfo(userID.ToString());
+            if (uinfo != null)
+            {
+                if (uinfo.HomeRegionID != UUID.Zero)
+                {
+                    home = m_GridService.GetRegionByUUID(UUID.Zero, uinfo.HomeRegionID);
+                    position = uinfo.HomePosition;
+                    lookAt = uinfo.HomeLookAt;
+                }
+                if (home == null)
+                {
+                    List<GridRegion> defs = m_GridService.GetDefaultRegions(UUID.Zero);
+                    if (defs != null && defs.Count > 0)
+                        home = defs[0];
+                }
+            }
+
+            return home;
+        }
+
+        public bool LoginAgentToGrid(AgentCircuitData agentCircuit, GridRegion gatekeeper, GridRegion finalDestination, out string reason)
+        {
+            m_log.DebugFormat("[USER AGENT SERVICE]: Request to login user {0} {1} to grid {2}", 
+                agentCircuit.firstname, agentCircuit.lastname, gatekeeper.ExternalHostName +":"+ gatekeeper.HttpPort);
+
+            // Take the IP address + port of the gatekeeper (reg) plus the info of finalDestination
+            GridRegion region = new GridRegion(gatekeeper);
+            region.RegionName = finalDestination.RegionName;
+            region.RegionID = finalDestination.RegionID;
+            region.RegionLocX = finalDestination.RegionLocX;
+            region.RegionLocY = finalDestination.RegionLocY;
+
+            // Generate a new service session
+            agentCircuit.ServiceSessionID = "http://" + region.ExternalHostName + ":" + region.HttpPort + ";" + UUID.Random();
+            TravelingAgentInfo old = UpdateTravelInfo(agentCircuit, region);
+
+            bool success = m_GatekeeperConnector.CreateAgent(region, agentCircuit, (uint)Constants.TeleportFlags.ViaLogin, out reason);
+
+            if (!success)
+            {
+                m_log.DebugFormat("[USER AGENT SERVICE]: Unable to login user {0} {1} to grid {2}, reason: {3}", 
+                    agentCircuit.firstname, agentCircuit.lastname, region.ExternalHostName + ":" + region.HttpPort, reason);
+
+                // restore the old travel info
+                lock (m_TravelingAgents)
+                    m_TravelingAgents[agentCircuit.SessionID] = old;
+
+                return false;
+            }
+
+            return true;
+        }
+
+        TravelingAgentInfo UpdateTravelInfo(AgentCircuitData agentCircuit, GridRegion region)
+        {
+            TravelingAgentInfo travel = new TravelingAgentInfo();
+            TravelingAgentInfo old = null;
+            lock (m_TravelingAgents)
+            {
+                if (m_TravelingAgents.ContainsKey(agentCircuit.SessionID))
+                {
+                    old = m_TravelingAgents[agentCircuit.SessionID];
+                }
+
+                m_TravelingAgents[agentCircuit.SessionID] = travel;
+            }
+            travel.UserID = agentCircuit.AgentID;
+            travel.GridExternalName = region.ExternalHostName + ":" + region.HttpPort;
+            travel.ServiceToken = agentCircuit.ServiceSessionID;
+            if (old != null)
+                travel.ClientToken = old.ClientToken;
+
+            return old;
+        }
+
+        public void LogoutAgent(UUID userID, UUID sessionID)
+        {
+            m_log.DebugFormat("[USER AGENT SERVICE]: User {0} logged out", userID);
+
+            lock (m_TravelingAgents)
+            {
+                List<UUID> travels = new List<UUID>();
+                foreach (KeyValuePair<UUID, TravelingAgentInfo> kvp in m_TravelingAgents)
+                    if (kvp.Value == null) // do some clean up
+                        travels.Add(kvp.Key);
+                    else if (kvp.Value.UserID == userID)
+                        travels.Add(kvp.Key);
+                foreach (UUID session in travels)
+                    m_TravelingAgents.Remove(session);
+            }
+        }
+
+        // We need to prevent foreign users with the same UUID as a local user
+        public bool AgentIsComingHome(UUID sessionID, string thisGridExternalName)
+        {
+            if (!m_TravelingAgents.ContainsKey(sessionID))
+                return false;
+
+            TravelingAgentInfo travel = m_TravelingAgents[sessionID];
+            return travel.GridExternalName == thisGridExternalName;
+        }
+
+        public bool VerifyClient(UUID sessionID, string token)
+        {
+            return true;
+
+            // Commenting this for now until I understand better what part of a sender's
+            // info stays unchanged throughout a session
+            //
+            //if (m_TravelingAgents.ContainsKey(sessionID))
+            //{
+            //    // Aquiles heel. Must trust the first grid upon login
+            //    if (m_TravelingAgents[sessionID].ClientToken == string.Empty)
+            //    {
+            //        m_TravelingAgents[sessionID].ClientToken = token;
+            //        return true;
+            //    }
+            //    return m_TravelingAgents[sessionID].ClientToken == token;
+            //}
+            //return false;
+        }
+
+        public bool VerifyAgent(UUID sessionID, string token)
+        {
+            if (m_TravelingAgents.ContainsKey(sessionID))
+            {
+                m_log.DebugFormat("[USER AGENT SERVICE]: Verifying agent token {0} against {1}", token, m_TravelingAgents[sessionID].ServiceToken);
+                return m_TravelingAgents[sessionID].ServiceToken == token;
+            }
+
+            m_log.DebugFormat("[USER AGENT SERVICE]: Token verification for session {0}: no such session", sessionID);
+
+            return false;
+        }
+
+    }
+
+    class TravelingAgentInfo
+    {
+        public UUID UserID;
+        public string GridExternalName = string.Empty;
+        public string ServiceToken = string.Empty;
+        public string ClientToken = string.Empty;
+    }
+
+}