diff --git a/CHANGES-4.3.md b/CHANGES-4.3.md
index 55882077e..eb5587d78 100644
--- a/CHANGES-4.3.md
+++ b/CHANGES-4.3.md
@@ -10,6 +10,10 @@ File format:
 - One list item per change topic
   Change log ends with a list of GitHub PRs
 
+## v4.3.22
+
+### Minor changes
+
 ## v4.3.21
 
 ### Enhancements
@@ -23,13 +27,15 @@ File format:
 - TLS listener default buffer size to 4KB [#9007](https://github.com/emqx/emqx/pull/9007)
   Eliminate uncertainty that the buffer size is set by OS default.
 
-- Fix delayed publish inaccurate caused by os time change. [#8908](https://github.com/emqx/emqx/pull/8908)
-
 - Disable authorization for `api/v4/emqx_prometheus` endpoint. [8955](https://github.com/emqx/emqx/pull/8955)
 
 - Added a test to prevent a last will testament message to be
   published when a client is denied connection. [#8894](https://github.com/emqx/emqx/pull/8894)
 
+### Bug fixes
+
+- Fix delayed publish inaccurate caused by os time change. [#8908](https://github.com/emqx/emqx/pull/8908)
+
 ## v4.3.20
 
 ### Bug fixes
diff --git a/src/emqx.appup.src b/src/emqx.appup.src
index 600c87d8d..4bca299a1 100644
--- a/src/emqx.appup.src
+++ b/src/emqx.appup.src
@@ -11,7 +11,9 @@
      {load_module,emqx_cm,brutal_purge,soft_purge,[]},
      {load_module,emqx_ws_connection,brutal_purge,soft_purge,[]},
      {load_module,emqx_tracer,brutal_purge,soft_purge,[]},
-     {load_module,emqx_channel,brutal_purge,soft_purge,[]}]},
+     {load_module,emqx_channel,brutal_purge,soft_purge,[]},
+     {load_module,emqx_misc,brutal_purge,soft_purge,[]},
+     {load_module,emqx,brutal_purge,soft_purge,[]}]},
    {"4.3.20",
     [{load_module,emqx_plugins,brutal_purge,soft_purge,[]},
      {load_module,emqx_router_helper,brutal_purge,soft_purge,[]},
@@ -24,7 +26,9 @@
      {load_module,emqx_channel,brutal_purge,soft_purge,[]},
      {load_module,emqx_app,brutal_purge,soft_purge,[]},
      {load_module,emqx_message,brutal_purge,soft_purge,[]},
-     {load_module,emqx_cm,brutal_purge,soft_purge,[]}]},
+     {load_module,emqx_cm,brutal_purge,soft_purge,[]},
+     {load_module,emqx_misc,brutal_purge,soft_purge,[]},
+     {load_module,emqx,brutal_purge,soft_purge,[]}]},
    {"4.3.19",
     [{load_module,emqx_listeners,brutal_purge,soft_purge,[]},
      {load_module,emqx_router_helper,brutal_purge,soft_purge,[]},
@@ -37,6 +41,7 @@
      {load_module,emqx_message,brutal_purge,soft_purge,[]},
      {load_module,emqx_misc,brutal_purge,soft_purge,[]},
      {load_module,emqx_app,brutal_purge,soft_purge,[]},
+     {load_module,emqx,brutal_purge,soft_purge,[]},
      {load_module,emqx_cm,brutal_purge,soft_purge,[]},
      {load_module,emqx_plugins,brutal_purge,soft_purge,[]},
      {load_module,emqx_channel,brutal_purge,soft_purge,[]}]},
@@ -54,6 +59,7 @@
      {load_module,emqx_cm,brutal_purge,soft_purge,[]},
      {load_module,emqx_channel,brutal_purge,soft_purge,[]},
      {load_module,emqx_app,brutal_purge,soft_purge,[]},
+     {load_module,emqx,brutal_purge,soft_purge,[]},
      {load_module,emqx_plugins,brutal_purge,soft_purge,[]}]},
    {"4.3.17",
     [{load_module,emqx_listeners,brutal_purge,soft_purge,[]},
@@ -819,7 +825,8 @@
      {load_module,emqx_message,brutal_purge,soft_purge,[]},
      {load_module,emqx_limiter,brutal_purge,soft_purge,[]}]},
    {<<".*">>,[]}],
-  [{"4.3.21",
+  [
+   {"4.3.21",
     [{load_module,emqx_alarm,brutal_purge,soft_purge,[]},
      {load_module,emqx_app,brutal_purge,soft_purge,[]},
      {load_module,emqx_connection,brutal_purge,soft_purge,[]},
@@ -829,7 +836,9 @@
      {load_module,emqx_cm,brutal_purge,soft_purge,[]},
      {load_module,emqx_ws_connection,brutal_purge,soft_purge,[]},
      {load_module,emqx_tracer,brutal_purge,soft_purge,[]},
-     {load_module,emqx_channel,brutal_purge,soft_purge,[]}]},
+     {load_module,emqx_channel,brutal_purge,soft_purge,[]},
+     {load_module,emqx_misc,brutal_purge,soft_purge,[]},
+     {load_module,emqx,brutal_purge,soft_purge,[]}]},
    {"4.3.20",
     [{load_module,emqx_plugins,brutal_purge,soft_purge,[]},
      {load_module,emqx_router_helper,brutal_purge,soft_purge,[]},
@@ -842,7 +851,9 @@
      {load_module,emqx_channel,brutal_purge,soft_purge,[]},
      {load_module,emqx_app,brutal_purge,soft_purge,[]},
      {load_module,emqx_message,brutal_purge,soft_purge,[]},
-     {load_module,emqx_cm,brutal_purge,soft_purge,[]}]},
+     {load_module,emqx_cm,brutal_purge,soft_purge,[]},
+     {load_module,emqx_misc,brutal_purge,soft_purge,[]},
+     {load_module,emqx,brutal_purge,soft_purge,[]}]},
    {"4.3.19",
     [{load_module,emqx_listeners,brutal_purge,soft_purge,[]},
      {load_module,emqx_router_helper,brutal_purge,soft_purge,[]},
@@ -855,6 +866,7 @@
      {load_module,emqx_message,brutal_purge,soft_purge,[]},
      {load_module,emqx_misc,brutal_purge,soft_purge,[]},
      {load_module,emqx_app,brutal_purge,soft_purge,[]},
+     {load_module,emqx,brutal_purge,soft_purge,[]},
      {load_module,emqx_cm,brutal_purge,soft_purge,[]},
      {load_module,emqx_plugins,brutal_purge,soft_purge,[]},
      {load_module,emqx_channel,brutal_purge,soft_purge,[]}]},
@@ -872,6 +884,7 @@
      {load_module,emqx_cm,brutal_purge,soft_purge,[]},
      {load_module,emqx_channel,brutal_purge,soft_purge,[]},
      {load_module,emqx_app,brutal_purge,soft_purge,[]},
+     {load_module,emqx,brutal_purge,soft_purge,[]},
      {load_module,emqx_plugins,brutal_purge,soft_purge,[]}]},
    {"4.3.17",
     [{load_module,emqx_listeners,brutal_purge,soft_purge,[]},
diff --git a/src/emqx.erl b/src/emqx.erl
index 469a4672b..ae78e5795 100644
--- a/src/emqx.erl
+++ b/src/emqx.erl
@@ -228,6 +228,7 @@ shutdown() ->
 
 shutdown(Reason) ->
     ?LOG(critical, "emqx shutdown for ~s", [Reason]),
+    on_shutdown(Reason),
     _ = emqx_plugins:unload(),
     lists:foreach(fun application:stop/1
                  , lists:reverse(default_started_applications())
@@ -238,10 +239,12 @@ reboot() ->
         true ->
             _ = application:stop(emqx_dashboard), %% dashboard must be started after mnesia
             lists:foreach(fun application:start/1 , default_started_applications()),
-            application:start(emqx_dashboard);
+            _ = application:start(emqx_dashboard),
+            on_reboot();
 
         false ->
-            lists:foreach(fun application:start/1 , default_started_applications())
+            lists:foreach(fun application:start/1 , default_started_applications()),
+            on_reboot()
     end.
 
 is_application_running(App) ->
@@ -256,6 +259,32 @@ default_started_applications() ->
     [gproc, esockd, ranch, cowboy, ekka, emqx, emqx_modules].
 -endif.
 
+-ifdef(EMQX_ENTERPRISE).
+on_reboot() ->
+    try
+        _ = emqx_license_api:bootstrap_license(),
+        ok
+    catch
+        Kind:Reason:Stack ->
+            ?LOG(critical, "~p while rebooting: ~p, ~p", [Kind, Reason, Stack]),
+            ok
+    end,
+    ok.
+
+on_shutdown(join) ->
+    emqx_modules:sync_load_modules_file(),
+    ok;
+on_shutdown(_) ->
+    ok.
+
+-else.
+on_reboot() ->
+    ok.
+
+on_shutdown(_) ->
+    ok.
+-endif.
+
 %%--------------------------------------------------------------------
 %% Internal functions
 %%--------------------------------------------------------------------
diff --git a/src/emqx_misc.erl b/src/emqx_misc.erl
index 813ab84e8..bfda5bb38 100644
--- a/src/emqx_misc.erl
+++ b/src/emqx_misc.erl
@@ -45,6 +45,7 @@
         , index_of/2
         , maybe_parse_ip/1
         , ipv6_probe/1
+        , ipv6_probe/2
         ]).
 
 -export([ bin2hexstr_A_F/1
@@ -84,12 +85,15 @@ maybe_parse_ip(Host) ->
 
 %% @doc Add `ipv6_probe' socket option if it's supported.
 ipv6_probe(Opts) ->
+    ipv6_probe(Opts, true).
+
+ipv6_probe(Opts, Ipv6Probe) when is_boolean(Ipv6Probe) orelse is_integer(Ipv6Probe) ->
     Bool = try gen_tcp:ipv6_probe()
            catch _ : _ -> false end,
-    ipv6_probe(Bool, Opts).
+    ipv6_probe(Bool, Opts, Ipv6Probe).
 
-ipv6_probe(false, Opts) -> Opts;
-ipv6_probe(true, Opts) -> [{ipv6_probe, true} | Opts].
+ipv6_probe(false, Opts, _) -> Opts;
+ipv6_probe(true, Opts, Ipv6Probe) -> [{ipv6_probe, Ipv6Probe} | Opts].
 
 %% @doc Merge options
 -spec(merge_opts(Opts, Opts) -> Opts when Opts :: proplists:proplist()).