Add log messages on teleport failure to better pin down the cause.

OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs

@@ -399,6 +399,10 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
                 if (!UpdateAgent(reg, finalDestination, agent))
                 {
                     // Region doesn't take it
+                    m_log.WarnFormat(
+                        "[ENTITY TRANSFER MODULE]: UpdateAgent failed on teleport of {0} to {1}.  Returning avatar to source region.", 
+                        sp.Name, finalDestination.RegionName);
+                    
                     Fail(sp, finalDestination);
                     return;
                 }
@@ -425,16 +429,18 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
                 // that the client contacted the destination before we send the attachments and close things here.
                 if (!WaitForCallback(sp.UUID))
                 {
+                    m_log.WarnFormat(
+                        "[ENTITY TRANSFER MODULE]: Teleport of {0} to {1} failed due to no callback from destination region.  Returning avatar to source region.", 
+                        sp.Name, finalDestination.RegionName);
+                    
                     Fail(sp, finalDestination);                   
                     return;
                 }
 
-
                 // CrossAttachmentsIntoNewRegion is a synchronous call. We shouldn't need to wait after it
                 CrossAttachmentsIntoNewRegion(finalDestination, sp, true);
 
                 // Well, this is it. The agent is over there.
-
                 KillEntity(sp.Scene, sp.LocalId);
 
                 // May need to logout or other cleanup

OpenSim/Services/Connectors/Simulation/SimulationServiceConnector.cs

@@ -79,9 +79,6 @@ namespace OpenSim.Services.Connectors.Simulation
             return "agent/";
         }
 
-        /// <summary>
-        /// 
-        /// </summary>
         public bool CreateAgent(GridRegion destination, AgentCircuitData aCircuit, uint flags, out string reason)
         {
             // m_log.DebugFormat("[REMOTE SIMULATION CONNECTOR]: CreateAgent start");
@@ -109,6 +106,9 @@ namespace OpenSim.Services.Connectors.Simulation
                 if (result["Success"].AsBoolean())
                     return true;
                 
+                m_log.WarnFormat(
+                    "[REMOTE SIMULATION CONNECTOR]: Failed to create agent {0} {1} at remote simulator {1}", 
+                    aCircuit.firstname, aCircuit.lastname, destination.RegionName);                       
                 reason = result["Message"] != null ? result["Message"].AsString() : "error";
                 return false;
             }

OpenSim/Services/Interfaces/ISimulationService.cs

@@ -40,6 +40,13 @@ namespace OpenSim.Services.Interfaces
 
         #region Agents
 
+        /// <summary>
+        /// Ask the simulator hosting the destination to create an agent on that region.
+        /// </summary>
+        /// <param name="destination"></param>
+        /// <param name="aCircuit"></param>
+        /// <param name="flags"></param>
+        /// <param name="reason">Reason message in the event of a failure.</param>        
         bool CreateAgent(GridRegion destination, AgentCircuitData aCircuit, uint flags, out string reason);
 
         /// <summary>