diff --git a/server/masterserver/app.cc b/server/masterserver/app.cc
index 452a169..e805585 100755
--- a/server/masterserver/app.cc
+++ b/server/masterserver/app.cc
@@ -383,6 +383,11 @@ void App::ProcessIMMsg()
                 #endif
             }
             break;
+        case IM_IMSSocketDisconnect:
+            {
+                SvrMgr::Instance()->OnIMServerDisconnect(pdelnode->params);
+            }
+            break;
         case IM_ExecGM:
             {
                 HandlerMgr::Instance()->ProcGMMsg(pdelnode->params.param3,
diff --git a/server/masterserver/cachemgr.cc b/server/masterserver/cachemgr.cc
index 691670e..d2adc2e 100644
--- a/server/masterserver/cachemgr.cc
+++ b/server/masterserver/cachemgr.cc
@@ -31,3 +31,9 @@ void CacheMgr::_SS_IM_IMServerList(f8::MsgHdr& hdr, const ss::SS_IM_IMServerList
 {
 
 }
+
+Friend* CacheMgr::GetFriendData(const std::string& account_id)
+{
+    auto itr = friend_hash_.find(account_id);
+    return itr != friend_hash_.end() ? itr->second : nullptr;
+}
diff --git a/server/masterserver/cachemgr.h b/server/masterserver/cachemgr.h
index ac2074d..da5954b 100644
--- a/server/masterserver/cachemgr.h
+++ b/server/masterserver/cachemgr.h
@@ -21,8 +21,9 @@ class CacheMgr : public a8::Singleton<CacheMgr>
     void _SS_IM_PullUserList(f8::MsgHdr& hdr, const ss::SS_IM_PullUserList& msg);
     void _SS_IM_IMServerList(f8::MsgHdr& hdr, const ss::SS_IM_IMServerList& msg);
 
- private:
+    Friend* GetFriendData(const std::string& account_id);
 
  private:
 
+    std::map<std::string, Friend*> friend_hash_;
 };
diff --git a/server/masterserver/svrmgr.cc b/server/masterserver/svrmgr.cc
index ff0df1c..175fe89 100644
--- a/server/masterserver/svrmgr.cc
+++ b/server/masterserver/svrmgr.cc
@@ -8,6 +8,7 @@
 #include "app.h"
 #include "GGListener.h"
 #include "IMListener.h"
+#include "cachemgr.h"
 
 void SvrMgr::Init()
 {
@@ -29,7 +30,7 @@ void SvrMgr::_SS_WSP_RequestTargetServer(f8::MsgHdr& hdr, const ss::SS_WSP_Reque
 {
     ss::SS_MS_ResponseTargetServer respmsg;
     respmsg.set_context_id(msg.context_id());
-    SvrNode* node = AllocNode();
+    SvrNode* node = AllocNode(msg.account_id());
     if (node) {
         respmsg.set_host(node->ip);
         respmsg.set_port(node->port);
@@ -43,10 +44,25 @@ void SvrMgr::_SS_WSP_RequestTargetServer(f8::MsgHdr& hdr, const ss::SS_WSP_Reque
 void SvrMgr::_SS_IM_ReportServerInfo(f8::MsgHdr& hdr, const ss::SS_IM_ReportServerInfo& msg)
 {
     SvrNode* svr = GetNodeBySocket(hdr.socket_handle);
-    std::string key = msg.ip() + ":" + a8::XValue(msg.port()).GetString();
-
-    svr = GetNodeByKey(key);
     if (svr) {
+        if (svr->instance_id != msg.instance_id() ||
+            svr->ip != msg.ip() ||
+            svr->port != msg.port()
+            ) {
+            a8::UdpLog::Instance()->Warning
+                (
+                 "serverA %s:%d-%d serverB %s:%d-%d",
+                 {
+                  svr->ip,
+                  svr->port,
+                  svr->instance_id,
+                  msg.ip(),
+                  msg.port(),
+                  msg.instance_id()
+                 });
+            IMListener::Instance()->ForceCloseClient(hdr.socket_handle);
+            return;
+        }
         if (svr->online_num != msg.online_num() ||
             svr->servicing != msg.servicing()
             ) {
@@ -55,17 +71,19 @@ void SvrMgr::_SS_IM_ReportServerInfo(f8::MsgHdr& hdr, const ss::SS_IM_ReportServ
             RearrangeNode();
         }
         svr->last_active_tick = a8::XGetTickCount();
-        if (svr->instance_id != msg.instance_id()) {
+    } else {
+        std::string key = msg.ip() + ":" + a8::XValue(msg.port()).GetString();
+        if (GetNodeByKey(key)) {
             a8::UdpLog::Instance()->Warning
                 (
-                 "report server info %s %d %d",
+                 "server %s:%d registered",
                  {
-                  key,
-                  svr->instance_id,
-                  msg.instance_id()
+                     msg.ip(),
+                     msg.port()
                  });
+            IMListener::Instance()->ForceCloseClient(hdr.socket_handle);
+            return;
         }
-    } else {
         svr = new SvrNode;
         svr->socket_handle = hdr.socket_handle;
         svr->key = key;
@@ -128,8 +146,21 @@ void SvrMgr::___GSList(f8::JsonHttpRequest* request)
     }
 }
 
-SvrNode* SvrMgr::AllocNode()
+void SvrMgr::OnIMServerDisconnect(a8::XParams& param)
 {
+    SvrNode* svr = GetNodeBySocket(param.sender);
+    if (svr) {
+        RemoveNode(svr);
+        RearrangeNode();
+    }
+}
+
+SvrNode* SvrMgr::AllocNode(const std::string& account_id)
+{
+    Friend* friend_data = CacheMgr::Instance()->GetFriendData(account_id);
+    if (friend_data && friend_data->svr_node) {
+        return friend_data->svr_node;
+    }
     if (node_sorted_list_.empty()) {
         return nullptr;
     }
@@ -186,17 +217,7 @@ void SvrMgr::ClearTimeOutNode()
         }
     }
     for (SvrNode* node : time_out_nodes) {
-        {
-            for (size_t i = 0; i < node_sorted_list_.size(); ++i) {
-                if (node_sorted_list_[i] == node) {
-                    node_sorted_list_.erase(node_sorted_list_.begin() + i);
-                    break;
-                }
-            }
-        }
-        node_key_hash_.erase(node->key);
-        socket_hash_.erase(node->socket_handle);
-        delete node;
+        RemoveNode(node);
     }
     RearrangeNode();
 }
@@ -212,3 +233,20 @@ SvrNode* SvrMgr::GetNodeBySocket(int socket_handle)
     auto itr = socket_hash_.find(socket_handle);
     return itr != socket_hash_.end() ? itr->second : nullptr;
 }
+
+void SvrMgr::RemoveNode(SvrNode* node)
+{
+    {
+        for (size_t i = 0; i < node_sorted_list_.size(); ++i) {
+            if (node_sorted_list_[i] == node) {
+                node_sorted_list_.erase(node_sorted_list_.begin() + i);
+                break;
+            }
+        }
+    }
+    {
+        node_key_hash_.erase(node->key);
+        socket_hash_.erase(node->socket_handle);
+    }
+    delete node;
+}
diff --git a/server/masterserver/svrmgr.h b/server/masterserver/svrmgr.h
index 0cd685d..c6b2571 100644
--- a/server/masterserver/svrmgr.h
+++ b/server/masterserver/svrmgr.h
@@ -41,12 +41,15 @@ class SvrMgr : public a8::Singleton<SvrMgr>
 
     void ___GSList(f8::JsonHttpRequest* request);
 
+    void OnIMServerDisconnect(a8::XParams& param);
+
  private:
-    SvrNode* AllocNode();
+    SvrNode* AllocNode(const std::string& account_id);
     void RearrangeNode();
     void ClearTimeOutNode();
     SvrNode* GetNodeByKey(const std::string& key);
     SvrNode* GetNodeBySocket(int socket_handle);
+    void RemoveNode(SvrNode* node);
 
  private: