diff --git a/README.md b/README.md
index 4f87914..9ac8d66 100644
--- a/README.md
+++ b/README.md
@@ -12,9 +12,10 @@
 
 ```
 
-## 依赖
+## 版本
 
 ```
+v2.3 | 修复zcan没有回执的BUG
 
 ```
 
diff --git a/src/configs/version.hpp b/src/configs/version.hpp
index c681d56..28d3f8e 100644
--- a/src/configs/version.hpp
+++ b/src/configs/version.hpp
@@ -1,2 +1,2 @@
 #pragma once
-#define VERSION "2.2"
\ No newline at end of file
+#define VERSION "2.3"
\ No newline at end of file
diff --git a/src/service/extapi_service.cpp b/src/service/extapi_service.cpp
index 68f7a21..1c6b878 100644
--- a/src/service/extapi_service.cpp
+++ b/src/service/extapi_service.cpp
@@ -120,7 +120,7 @@ void ExtAPIService::initialize() {
           }
 
           string chname = webSocket.getUrl().substr(1);
-          WbesocketConnectMgrService::insertNewClient(chname, findws(chname), make_shared<WebSocketConnectInfo>(connectionState->getRemoteIp()));
+          WbesocketConnectMgrService::insertNewClient(chname, findws(&webSocket), make_shared<WebSocketConnectInfo>(connectionState->getRemoteIp()));
         } else if (msg->type == ix::WebSocketMessageType::Message) {
           string chname  = webSocket.getUrl().substr(1);
           auto   channel = DataChannelMgr::findByChannel(chname);
@@ -132,7 +132,7 @@ void ExtAPIService::initialize() {
         } else if (msg->type == ix::WebSocketMessageType::Close) {
           string chname = webSocket.getUrl().substr(1);
           logger->info("close connect ip: {},url: {}, channel:{}", connectionState->getRemoteIp(), webSocket.getUrl(), chname);
-          WbesocketConnectMgrService::removeClient(chname, findws(chname));
+          WbesocketConnectMgrService::removeClient(chname, findws(&webSocket));
         }
       });
 
@@ -144,10 +144,15 @@ void ExtAPIService::initialize() {
     WbesocketConnectMgrService::findClientByName(fromch->getAlias(), clients);
     for (auto ch : clients) {
       if (ch) {
+        WebSocketSendInfo sendInfo;
         if (binary) {
-          ch->sendBinary(string(data, len));
+          sendInfo = ch->sendBinary(string(data, len));
         } else {
-          ch->sendText(string(data, len));
+          sendInfo = ch->sendText(string(data, len));
+        }
+
+        if (!sendInfo.success) {
+          logger->error("send data to client {} failed", (int64_t)ch.get());
         }
       }
     }
@@ -184,12 +189,12 @@ void ExtAPIService::initialize() {
   logger->info("======================================================");
 };
 
-shared_ptr<WebSocket> ExtAPIService::findws(string chname) {
-  if (chname.empty()) return nullptr;
+shared_ptr<WebSocket> ExtAPIService::findws(WebSocket *ws) {
+  if (!ws) return nullptr;
 
   auto clients = m_wsServer->getClients();
   for (auto it : clients) {
-    if (it->getUrl().substr(1) == chname) {
+    if (it.get() == ws) {
       return it;
     }
   }
diff --git a/src/service/extapi_service.hpp b/src/service/extapi_service.hpp
index d3449d2..603e3fe 100644
--- a/src/service/extapi_service.hpp
+++ b/src/service/extapi_service.hpp
@@ -48,6 +48,6 @@ class ExtAPIService {
   void initialize();
 
  private:
-  shared_ptr<WebSocket> findws(string chname);
+  shared_ptr<WebSocket> findws(WebSocket* ws);
 };
 }  // namespace iflytop
\ No newline at end of file
diff --git a/src/service/wbesocket_connect_mgr_service.cpp b/src/service/wbesocket_connect_mgr_service.cpp
index 306fba0..1343bcf 100644
--- a/src/service/wbesocket_connect_mgr_service.cpp
+++ b/src/service/wbesocket_connect_mgr_service.cpp
@@ -48,9 +48,22 @@ void WbesocketConnectMgrService::findClientByName(string chname, list<shared_ptr
     return;
   }
 
+  list<shared_ptr<WebSocket>> rmoveClients;
+
   for (auto ch : it->second) {
+    if (ch->getReadyState() == ix::ReadyState::Closed || ch->getReadyState() == ix::ReadyState::Closing) {
+      rmoveClients.push_back(ch);
+      continue;
+    }
     clients.push_back(ch);
   }
+
+  for (auto ch : rmoveClients) {
+    it->second.remove(ch);
+    wsClientsInfo.erase((void *)ch.get());
+    GET_LOGGER(WSConnectMgr)->info("remove client: {} {}, channel: {}", ch->getUrl(), (void *)ch.get(), chname);
+  }
+
 }
 
 json WbesocketConnectMgrService::getConnectionList() {
diff --git a/src/service/wbesocket_connect_mgr_service.hpp b/src/service/wbesocket_connect_mgr_service.hpp
index a6519e5..f4e52dc 100644
--- a/src/service/wbesocket_connect_mgr_service.hpp
+++ b/src/service/wbesocket_connect_mgr_service.hpp
@@ -45,6 +45,8 @@ class WbesocketConnectMgrService {
   static void removeClient(string chname, shared_ptr<WebSocket> client);
   static void findClientByName(string chname, list<shared_ptr<WebSocket>> &clients);
   static json getConnectionList();
+
+  static void updateConnectList();
 };
 
 }  // namespace iflytop