diff --git a/.env b/.env
index 38af90b..d03d30a 100644
--- a/.env
+++ b/.env
@@ -23,6 +23,9 @@ APP_VERSION=1.0.0
 
 APP_NAME=KevaChat
 
+# Disable any activity and print the message
+APP_MAINTENANCE=
+
 # Connect memcached
 APP_MEMCACHED_HOST=127.0.0.1
 APP_MEMCACHED_PORT=11211
@@ -55,8 +58,8 @@ APP_KEVACOIN_ROOM_NAMESPACES_READONLY=EDIT_ME
 # Redirect from index page to default room
 APP_KEVACOIN_ROOM_NAMESPACE_DEFAULT=EDIT_ME
 
-# Allow users to read external node rooms (true|false)
-APP_KEVACOIN_ROOM_NAMESPACE_EXTERNAL=false
+# Allow users to read external node rooms
+APP_KEVACOIN_ROOM_NAMESPACE_EXTERNAL=
 
 # Allow remotes to create new rooms (namespaces)
 APP_ADD_ROOM_REMOTE_IP_REGEX=/.*/
diff --git a/config/services.yaml b/config/services.yaml
index 650f477..bc2d523 100644
--- a/config/services.yaml
+++ b/config/services.yaml
@@ -6,6 +6,7 @@
 parameters:
     app.version: '%env(APP_VERSION)%'
     app.name: '%env(APP_NAME)%'
+    app.maintenance: '%env(APP_MAINTENANCE)%'
     app.memcached.host: '%env(APP_MEMCACHED_HOST)%'
     app.memcached.port: '%env(APP_MEMCACHED_PORT)%'
     app.memcached.timeout: '%env(APP_MEMCACHED_TIMEOUT)%'
@@ -16,8 +17,8 @@ parameters:
     app.kevacoin.password: '%env(APP_KEVACOIN_PASSWORD)%'
     app.kevacoin.room.namespaces: '%env(APP_KEVACOIN_ROOM_NAMESPACES)%'
     app.kevacoin.room.namespaces.readonly: '%env(APP_KEVACOIN_ROOM_NAMESPACES_READONLY)%'
+    app.kevacoin.room.namespaces.external: '%env(APP_KEVACOIN_ROOM_NAMESPACES_EXTERNAL)%'
     app.kevacoin.room.namespace.default: '%env(APP_KEVACOIN_ROOM_NAMESPACE_DEFAULT)%'
-    app.kevacoin.room.namespace.external: '%env(APP_KEVACOIN_ROOM_NAMESPACE_EXTERNAL)%'
     app.kevacoin.boost.address: '%env(APP_KEVACOIN_BOOST_ADDRESS)%'
     app.kevacoin.explorer.url: '%env(APP_KEVACOIN_EXPLORER_URL)%'
     app.kevacoin.mine.pool.url: '%env(APP_KEVACOIN_MINE_POOL_URL)%'
diff --git a/public/css/default.css b/public/css/default.css
index 884ae8c..b69597b 100644
--- a/public/css/default.css
+++ b/public/css/default.css
@@ -12,6 +12,9 @@
 
     /* vars */
     --container-max-width: 768px;
+    --color-warning: #ee784e;
+    --color-error: #ff6363;
+    --color-default: #999;
 }
 
 *::placeholder
@@ -52,6 +55,17 @@ header > div
     margin: 8px 0;
 }
 
+header > div > code
+{
+    color: var(--color-error);
+    font-weight: bold;
+}
+
+header > div > sub > svg
+{
+    fill: var(--color-error);
+}
+
 main
 {
     display: block;
@@ -91,7 +105,7 @@ main ul > li
     margin: 8px 0;
     padding: 8px 0;
     word-wrap: break-word;
-    border-bottom: 1px #999 solid;
+    border-bottom: 1px var(--color-default) solid;
 }
 
 main ul > li:last-child
@@ -107,13 +121,13 @@ main ul > li p
 main ul li > span > svg
 {
     cursor: default;
-    fill: #999;
+    fill: var(--color-default);
     float: right;
 }
 
 main > sup > a > svg
 {
-    fill: #ee784e;
+    fill: var(--color-warning);
 }
 
 footer
@@ -157,7 +171,7 @@ footer > form > button
 
 footer > form > output
 {
-    color: #ff6363;
+    color: var(--color-error);
     display: block;
     font-weight: bolder;
     margin-bottom: 16px;
diff --git a/src/Controller/ModuleController.php b/src/Controller/ModuleController.php
index 5cb6fc2..9fc5b05 100644
--- a/src/Controller/ModuleController.php
+++ b/src/Controller/ModuleController.php
@@ -46,7 +46,8 @@ class ModuleController extends AbstractController
                 'explorer' =>
                 [
                     'url' => $this->getParameter('app.kevacoin.explorer.url')
-                ]
+                ],
+                'maintenance' => $this->getParameter('app.maintenance')
             ]
         );
     }
@@ -133,6 +134,8 @@ class ModuleController extends AbstractController
                         $request->get('namespace'),
                         explode('|', $this->getParameter('app.kevacoin.room.namespaces.readonly'))
                     )
+                    &&
+                    !$this->getParameter('app.maintenance')
                 )
             ]
         );
diff --git a/src/Controller/RoomController.php b/src/Controller/RoomController.php
index 0fa0241..41b5710 100644
--- a/src/Controller/RoomController.php
+++ b/src/Controller/RoomController.php
@@ -68,7 +68,7 @@ class RoomController extends AbstractController
                 (array) explode('|', $this->getParameter('app.kevacoin.room.namespaces'))
             )
             &&
-            $this->getParameter('app.kevacoin.room.namespace.external') === 'false'
+            $this->getParameter('app.kevacoin.room.namespaces.external')
         ) {
             // @TODO process to error page instead of redirect to default room
             return $this->redirectToRoute(
@@ -198,6 +198,19 @@ class RoomController extends AbstractController
         TranslatorInterface $translator
     ): Response
     {
+        // Check maintenance mode disabled
+        if ($this->getParameter('app.maintenance'))
+        {
+            return $this->redirectToRoute(
+                'room_namespace',
+                [
+                    'namespace' => $request->get('namespace'),
+                    'message'   => $request->get('message'),
+                    'error'     => $this->getParameter('app.maintenance')
+                ]
+            );
+        }
+
         // Connect memcached
         $memcached = new \Memcached();
         $memcached->addServer(
diff --git a/templates/default/module/info.html.twig b/templates/default/module/info.html.twig
index 0d8406a..142e7e4 100644
--- a/templates/default/module/info.html.twig
+++ b/templates/default/module/info.html.twig
@@ -22,4 +22,16 @@
             <a href="{{ mine.solo.url }}" target="_blank">{{ 'solo' | trans }}</a>
         {% endif %}
     {% endif %}
-</div>
\ No newline at end of file
+</div>
+{% if maintenance %}
+<div>
+    <sub>
+        <svg xmlns="http://www.w3.org/2000/svg" width="12" height="12" viewBox="0 0 16 16">
+            <path d="m9.97 4.88.953 3.811C10.159 8.878 9.14 9 8 9c-1.14 0-2.158-.122-2.923-.309L6.03 4.88C6.635 4.957 7.3 5 8 5s1.365-.043 1.97-.12m-.245-.978L8.97.88C8.718-.13 7.282-.13 7.03.88L6.275 3.9C6.8 3.965 7.382 4 8 4c.618 0 1.2-.036 1.725-.098zm4.396 8.613a.5.5 0 0 1 .037.96l-6 2a.5.5 0 0 1-.316 0l-6-2a.5.5 0 0 1 .037-.96l2.391-.598.565-2.257c.862.212 1.964.339 3.165.339s2.303-.127 3.165-.339l.565 2.257 2.391.598"/>
+        </svg>
+    </sub>
+    <code>
+        {{ maintenance }}
+    </code>
+</div>
+{% endif %}
\ No newline at end of file