diff --git a/src/emqx_cm.erl b/src/emqx_cm.erl
index cc73155ba..19bbc1cf2 100644
--- a/src/emqx_cm.erl
+++ b/src/emqx_cm.erl
@@ -152,6 +152,7 @@ monitor_client(ClientId, Pid, State = #state{monitors = Monitors}) ->
     State#state{monitors = dict:store(MRef, {ClientId, Pid}, Monitors)}.
 
 erase_monitor(MRef, State = #state{monitors = Monitors}) ->
+    erlang:demonitor(MRef, [flush]),
     State#state{monitors = dict:erase(MRef, Monitors)}.
 
 setstats(State = #state{statsfun = StatsFun}) ->
diff --git a/src/emqx_sm.erl b/src/emqx_sm.erl
index eac7743bc..78e53da70 100644
--- a/src/emqx_sm.erl
+++ b/src/emqx_sm.erl
@@ -311,5 +311,6 @@ monitor_session(ClientId, SessPid, State = #state{monitors = Monitors}) ->
     State#state{monitors = dict:store(MRef, ClientId, Monitors)}.
 
 erase_monitor(MRef, State = #state{monitors = Monitors}) ->
+    erlang:demonitor(MRef, [flush]),
     State#state{monitors = dict:erase(MRef, Monitors)}.
 
diff --git a/src/emqx_ws_client.erl b/src/emqx_ws_client.erl
index e1861684b..40e824238 100644
--- a/src/emqx_ws_client.erl
+++ b/src/emqx_ws_client.erl
@@ -91,23 +91,30 @@ clean_acl_cache(CPid, Topic) ->
 
 init([Env, WsPid, Req, ReplyChannel]) ->
     process_flag(trap_exit, true),
-    true = link(WsPid),
-    {ok, Peername} = Req:get(peername),
-    Headers = mochiweb_headers:to_list(
-                mochiweb_request:get(headers, Req)),
     Conn = Req:get(connection),
-    ProtoState = emqx_protocol:init(Conn, Peername, send_fun(ReplyChannel),
-                                    [{ws_initial_headers, Headers} | Env]),
-    IdleTimeout = get_value(client_idle_timeout, Env, 30000),
-    EnableStats = get_value(client_enable_stats, Env, false),
-    ForceGcCount = emqx_gc:conn_max_gc_count(),
-    {ok, #wsclient_state{connection     = Conn,
-                         ws_pid         = WsPid,
-                         peername       = Peername,
-                         proto_state    = ProtoState,
-                         enable_stats   = EnableStats,
-                         force_gc_count = ForceGcCount},
-     IdleTimeout, {backoff, 2000, 2000, 20000}, ?MODULE}.
+    true = link(WsPid),
+    case Req:get(peername) of
+        {ok, Peername} ->
+            Headers = mochiweb_headers:to_list(mochiweb_request:get(headers, Req)),
+            ProtoState = emqx_protocol:init(Conn, Peername, send_fun(ReplyChannel),
+                                              [{ws_initial_headers, Headers} | Env]),
+            IdleTimeout = get_value(client_idle_timeout, Env, 30000),
+            EnableStats = get_value(client_enable_stats, Env, false),
+            ForceGcCount = emqx_gc:conn_max_gc_count(),
+            {ok, #wsclient_state{connection     = Conn,
+                                 ws_pid         = WsPid,
+                                 peername       = Peername,
+                                 proto_state    = ProtoState,
+                                 enable_stats   = EnableStats,
+                                 force_gc_count = ForceGcCount},
+             IdleTimeout, {backoff, 2000, 2000, 20000}, ?MODULE};
+        {error, enotconn} -> Conn:fast_close(),
+                             exit(WsPid, normal),
+                             exit(normal);
+        {error, Reason}   -> Conn:fast_close(),
+                             exit(WsPid, normal),
+                             exit({shutdown, Reason})
+    end.
 
 prioritise_call(Msg, _From, _Len, _State) ->
     case Msg of info -> 10; stats -> 10; state -> 10; _ -> 5 end.
@@ -207,6 +214,9 @@ handle_info({shutdown, conflict, {ClientId, NewPid}}, State) ->
     ?WSLOG(warning, "clientid '~s' conflict with ~p", [ClientId, NewPid], State),
     shutdown(conflict, State);
 
+handle_info({shutdown, Reason}, State) ->
+    shutdown(Reason, State);
+
 handle_info({keepalive, start, Interval}, State = #wsclient_state{connection = Conn}) ->
     ?WSLOG(debug, "Keepalive at the interval of ~p", [Interval], State),
     case emqx_keepalive:start(stat_fun(Conn), Interval, {keepalive, check}) of