diff --git a/common/pool.py b/common/pool.py
index 93fe6c9..aa3761b 100644
--- a/common/pool.py
+++ b/common/pool.py
@@ -82,7 +82,23 @@ def _register_again():
             threading.Timer(delay_time, _register_again).start()
 
     async def async_unregister(self, s: socket.socket):
-        await asyncio.get_event_loop().run_in_executor(self.executor, self.unregister, s)
+        """添加超时机制的异步取消注册"""
+        try:
+            await asyncio.wait_for(
+                asyncio.get_event_loop().run_in_executor(self.executor, self.unregister, s),
+                timeout=5  # 5秒超时
+            )
+        except asyncio.TimeoutError:
+            LoggerFactory.get_logger().error(f"Timeout unregistering socket {s}")
+            # 强制从跟踪字典中移除
+            if s.fileno() in self.fileno_to_client:
+                self.fileno_to_client.pop(s.fileno())
+            if s in self.socket_to_register_lock:
+                self.socket_to_register_lock.pop(s)
+            if s in self.socket_to_recv_lock:
+                self.socket_to_recv_lock.pop(s)
+            if s in self.waiting_register_socket:
+                self.waiting_register_socket.remove(s)
 
     def unregister(self, s: socket.socket):
         if s not in self.socket_to_register_lock:
@@ -103,8 +119,10 @@ def unregister(self, s: socket.socket):
                 pass
             except OSError:
                 LoggerFactory.get_logger().error(traceback.format_exc())
-            self.socket_to_register_lock.pop(s)
-            self.socket_to_recv_lock.pop(s)
+            if s in self.socket_to_register_lock:
+                self.socket_to_register_lock.pop(s)
+            if s in self.socket_to_recv_lock:
+                self.socket_to_recv_lock.pop(s)
 
     def run(self):
         while True:
diff --git a/constant/system_constant.py b/constant/system_constant.py
index 225c305..a5161a7 100644
--- a/constant/system_constant.py
+++ b/constant/system_constant.py
@@ -15,6 +15,6 @@ class SystemConstant:
 
     COOKIE_EXPIRE_SECONDS = 3600 * 24
 
-    VERSION = '1.1.49'
+    VERSION = '1.1.52'
 
     GITHUB = 'https://github.com/sazima/proxynt'
diff --git a/server/tcp_forward_client.py b/server/tcp_forward_client.py
index 6889fc2..cd88f5b 100644
--- a/server/tcp_forward_client.py
+++ b/server/tcp_forward_client.py
@@ -200,16 +200,49 @@ async def send_to_socket(self, uid: bytes, message: bytes):
         if LoggerFactory.get_logger().isEnabledFor(logging.DEBUG):
             LoggerFactory.get_logger().debug(f'send to socket uid: {uid}, len: {len(message)}')
         try:
-            await asyncio.get_event_loop().sock_sendall(socket_client, message)
-        except OSError:
-            LoggerFactory.get_logger().warn(f'{uid} os error')
-            pass
+            # 添加超时机制
+            await asyncio.wait_for(asyncio.get_event_loop().sock_sendall(socket_client, message), timeout=30)
+        except asyncio.TimeoutError:
+            LoggerFactory.get_logger().warn(f"Socket send timeout for {uid}, closing connection")
+            # 使用 ensure_future 替代 create_task，兼容 Python 3.6
+            asyncio.ensure_future(self.close_connection_async(connection))
+            return
+        except OSError as e:
+            LoggerFactory.get_logger().warn(f'{uid} os error: {e}')
+            # 使用 ensure_future 替代 create_task，兼容 Python 3.6
+            asyncio.ensure_future(self.close_connection_async(connection))
+            return
         if not message:
-            asyncio.get_event_loop().run_in_executor(None, self.close_connection, connection)
-
+            # 使用异步方式关闭连接
+            asyncio.ensure_future(self.close_connection_async(connection))
         if LoggerFactory.get_logger().isEnabledFor(logging.DEBUG):
             LoggerFactory.get_logger().debug(f'send to socket cost time {time.time() - send_start_time}')
 
+    async def close_connection_async(self, connection: PublicSocketConnection):
+        """异步关闭连接，避免在事件循环中阻塞"""
+        try:
+            LoggerFactory.get_logger().info(f'async close {connection.uid}')
+            uid = connection.uid
+            if uid not in self.uid_to_connection:
+                return
+            # 从跟踪字典中移除
+            self.uid_to_connection.pop(uid, None)
+            self.socket_to_connection.pop(connection.socket, None)
+            connection.socket_server.delete_client(connection)
+            # 确保在关闭前取消注册
+            try:
+                await self.socket_event_loop.async_unregister(connection.socket)
+            except Exception as e:
+                LoggerFactory.get_logger().error(f'Error unregistering socket: {e}')
+
+            # 关闭套接字
+            try:
+                connection.socket.close()
+            except Exception as e:
+                LoggerFactory.get_logger().error(f'Error closing socket: {e}')
+        except Exception as e:
+            LoggerFactory.get_logger().error(f'close error {e}')
+
     def close_connection(self, connection: PublicSocketConnection):
         try:
             LoggerFactory.get_logger().info(f'close {connection.uid}')