diff --git a/src/host/iot_host.erl b/src/host/iot_host.erl
index 3c89ced..8f56320 100644
--- a/src/host/iot_host.erl
+++ b/src/host/iot_host.erl
@@ -311,13 +311,17 @@ handle_event(cast, heartbeat, _, State = #state{uuid = UUID, heartbeat_counter =
     maybe_mark_host_online(UUID),
     {keep_state, State#state{heartbeat_counter = HeartbeatCounter + 1}};
 
-%% 没有收到心跳包，主机下线, 设备状态不变
-handle_event(info, {timeout, _, heartbeat_ticker}, _, State = #state{uuid = UUID, heartbeat_counter = 0, channel_pid = ChannelPid}) ->
+%% UDP 心跳丢失但 SSL channel 仍在时，不能把 host 标记为离线。
+handle_event(info, {timeout, _, heartbeat_ticker}, _, State = #state{uuid = UUID, heartbeat_counter = 0, channel_pid = ChannelPid}) when is_pid(ChannelPid) ->
+    logger:warning("[iot_host] uuid: ~p, udp heartbeat lost but ssl channel is alive: ~p", [UUID, ChannelPid]),
+    maybe_mark_host_online(UUID),
+    erlang:start_timer(?HEARTBEAT_INTERVAL, self(), heartbeat_ticker),
+    {keep_state, State#state{heartbeat_counter = 0}};
+
+%% 没有收到 UDP 心跳且没有 SSL channel，主机下线, 设备状态不变
+handle_event(info, {timeout, _, heartbeat_ticker}, _, State = #state{uuid = UUID, heartbeat_counter = 0}) ->
     logger:warning("[iot_host] uuid: ~p, heartbeat lost, devices will unknown", [UUID]),
     maybe_mark_host_offline(UUID),
-
-    %% 关闭channel，主机需要重新连接，才能保存状态的一致
-    is_pid(ChannelPid) andalso ssl_channel:stop(ChannelPid, closed),
     erlang:start_timer(?HEARTBEAT_INTERVAL, self(), heartbeat_ticker),
 
     {keep_state, State#state{channel_pid = undefined, has_session = false, heartbeat_counter = 0}};