diff --git a/CHANGELOG.md b/CHANGELOG.md
index 91b0527ec..dc03415e9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,18 @@
 emqttd ChangeLog
 ================
 
+0.17.1-beta(2016-03-22)
+------------------------
+
+### Enhancements
+
+Time unit of session 'expired_after' changed to minute. (#479)
+
+### Dashboard
+
+Code Review and improve the design of Dashboard.
+
+
 0.17.0-beta(2016-03-15)
 ------------------------
 
diff --git a/plugins/emqttd_dashboard b/plugins/emqttd_dashboard
index c8d744eca..6254ae5ab 160000
--- a/plugins/emqttd_dashboard
+++ b/plugins/emqttd_dashboard
@@ -1 +1 @@
-Subproject commit c8d744ecafceae98fd570468b522f1262b7ff148
+Subproject commit 6254ae5ab42ef5479527f5e9766fcbf0d1485540
diff --git a/rel/files/emqttd.config.development b/rel/files/emqttd.config.development
index c655b3c3c..32424846b 100644
--- a/rel/files/emqttd.config.development
+++ b/rel/files/emqttd.config.development
@@ -104,8 +104,8 @@
             %% Statistics Collection Interval(seconds)
             {collect_interval, 20},
 
-            %% Expired after 2 days
-            {expired_after, 48}
+            %% Expired after 2 day (unit: minute)
+            {expired_after, 2880}
 
         ]},
         %% Queue
@@ -176,11 +176,12 @@
 
         %% Subscribe topics automatically when client connected
         {subscription, [
-            %% Static subscriptions from backend
-            backend,
 
             %% $c will be replaced by clientid
-            {"$queue/clients/$c", 1}
+            %% {"$queue/clients/$c", 1},
+
+            %% Static subscriptions from backend
+            backend
         ]}
 
         %% Rewrite rules
diff --git a/rel/files/emqttd.config.production b/rel/files/emqttd.config.production
index 837238c4f..df0a0da6e 100644
--- a/rel/files/emqttd.config.production
+++ b/rel/files/emqttd.config.production
@@ -96,8 +96,8 @@
             %% Statistics Collection Interval(seconds)
             {collect_interval, 0},
 
-            %% Expired after 2 days
-            {expired_after, 48}
+            %% Expired after 2 day (unit: minute)
+            {expired_after, 2880}
 
         ]},
         %% Queue
@@ -168,11 +168,12 @@
 
         %% Subscribe topics automatically when client connected
         {subscription, [
-            %% Static subscriptions from backend
-            backend,
 
             %% $c will be replaced by clientid
-            {"$queue/clients/$c", 1}
+            %% {"$queue/clients/$c", 1},
+
+            %% Static subscriptions from backend
+            backend
         ]}
 
         %% Rewrite rules
diff --git a/src/emqttd.app.src b/src/emqttd.app.src
index 19e661993..3c0db6351 100644
--- a/src/emqttd.app.src
+++ b/src/emqttd.app.src
@@ -1,7 +1,7 @@
 {application, emqttd,
  [
   {description, "Erlang MQTT Broker"},
-  {vsn, "0.17.0"},
+  {vsn, "0.17.1"},
   {id, "emqttd"},
   {modules, []},
   {registered, []},
diff --git a/src/emqttd_cli.erl b/src/emqttd_cli.erl
index fc1f300b9..d41bf26de 100644
--- a/src/emqttd_cli.erl
+++ b/src/emqttd_cli.erl
@@ -40,7 +40,7 @@
                         stack_size,
                         reductions]).
 
--define(MAX_LINES, 10000).
+-define(MAX_LIMIT, 10000).
 
 -define(APP, emqttd).
 
@@ -266,7 +266,7 @@ subscriptions(_) ->
 
 if_could_print(Tab, Fun) ->
     case mnesia:table_info(Tab, size) of
-        Size when Size >= ?MAX_LINES ->
+        Size when Size >= ?MAX_LIMIT ->
             ?PRINT("Could not list, too many ~ss: ~p~n", [Tab, Size]);
         _Size ->
             Keys = mnesia:dirty_all_keys(Tab),
diff --git a/src/emqttd_session.erl b/src/emqttd_session.erl
index ff15e415c..ac7af465b 100644
--- a/src/emqttd_session.erl
+++ b/src/emqttd_session.erl
@@ -230,7 +230,7 @@ init([CleanSess, ClientId, ClientPid]) ->
             retry_interval    = get_value(unack_retry_interval, SessEnv),
             await_rel_timeout = get_value(await_rel_timeout, SessEnv),
             max_awaiting_rel  = get_value(max_awaiting_rel, SessEnv),
-            expired_after     = get_value(expired_after, SessEnv) * 3600,
+            expired_after     = get_value(expired_after, SessEnv) * 60,
             collect_interval  = get_value(collect_interval, SessEnv, 0),
             timestamp         = os:timestamp()},
     emqttd_sm:register_session(CleanSess, ClientId, sess_info(Session)),