diff --git a/lib/db/api.js b/lib/db/api.js
index ff0a472c..2d80a9e6 100644
--- a/lib/db/api.js
+++ b/lib/db/api.js
@@ -1036,6 +1036,19 @@ dbapi.loadUser = function(email) {
   return db.run(r.table('users').get(email))
 }
 
+dbapi.updateUsersAlertMessage = function(alertMessage) {
+  return dbapi.getRootGroup().then(function(group) {
+    return db.run(r.table('users').get(group.owner.email).update({settings: {
+      alertMessage:
+        r.branch(
+          r.row.hasFields({settings: 'alertMessage'})
+        , r.row('settings')('alertMessage').merge(alertMessage)
+        , alertMessage
+        )
+    }}, {returnChanges: true}))
+  })
+}
+
 dbapi.updateUserSettings = function(email, changes) {
   return db.run(r.table('users').get(email).update({
     settings: changes
diff --git a/lib/units/api/controllers/users.js b/lib/units/api/controllers/users.js
index 7820710d..d9a11441 100644
--- a/lib/units/api/controllers/users.js
+++ b/lib/units/api/controllers/users.js
@@ -1,5 +1,5 @@
 /**
-* Copyright © 2019 code initially contributed by Orange SA, authors: Denis Barbaron - Licensed under the Apache license 2.0
+* Copyright © 2019-2024 code initially contributed by Orange SA, authors: Denis Barbaron - Licensed under the Apache license 2.0
 **/
 
 const dbapi = require('../../../db/api')
@@ -11,6 +11,7 @@ const wire = require('../../../wire')
 const wireutil = require('../../../wire/util')
 const userapi = require('./user')
 
+
 /* --------------------------------- PRIVATE FUNCTIONS --------------------------------------- */
 
 function userApiWrapper(fn, req, res) {
@@ -142,6 +143,92 @@ function getUserInfo(req, email) {
   })
 }
 
+function updateUsersAlertMessage(req, res) {
+  const lock = {}
+
+  return dbapi.lockUser(req.user.email).then(function(stats) {
+    if (!stats.replaced) {
+      return apiutil.lightComputeStats(res, stats)
+    }
+    lock.user = stats.changes[0].new_val
+
+    return dbapi.updateUsersAlertMessage(req.body).then(function(stats) {
+      if (stats.unchanged) {
+        dbapi.loadUser(req.user.email).then(function(user) {
+          apiutil.respond(res, 200, 'Unchanged (users alert message)',
+            {alertMessage: user.settings.alertMessage})
+        })
+      }
+      else {
+        apiutil.respond(res, 200, 'Updated (users alert message)',
+          {alertMessage: stats.changes[0].new_val.settings.alertMessage})
+      }
+    })
+    .catch(function(err) {
+      apiutil.internalError(res, 'Failed to update users alert message: ', err.stack)
+    })
+  })
+  .catch(function(err) {
+    if (err !== 'busy') {
+      throw err
+    }
+  })
+  .finally(function() {
+    lockutil.unlockUser(lock)
+  })
+}
+
+function getUsersAlertMessage(req, res) {
+  const fields = req.swagger.params.fields.value
+
+  dbapi.getRootGroup().then(function(group) {
+    return dbapi.loadUser(group.owner.email).then(function(user) {
+      if (typeof user.settings.alertMessage === 'undefined') {
+        const lock = {}
+
+        return dbapi.lockUser(req.user.email).then(function(stats) {
+          if (!stats.replaced) {
+            return apiutil.lightComputeStats(res, stats)
+          }
+          lock.user = stats.changes[0].new_val
+          const alertMessage = {
+            activation: 'False'
+          , data: '*** this site is currently under maintenance, please wait ***'
+          , level: 'Critical'
+          }
+
+          return dbapi.updateUsersAlertMessage(alertMessage).then(function(stats) {
+            if (!stats.errors) {
+              return stats.changes[0].new_val.settings.alertMessage
+            }
+            throw new Error('Failed to initialize users alert message')
+          })
+        })
+        .finally(function() {
+          lockutil.unlockUser(lock)
+        })
+      }
+      return user.settings.alertMessage
+    })
+    .then(function(alertMessage) {
+      if (fields) {
+        return _.pick(alertMessage, fields.split(','))
+      }
+      else {
+        return alertMessage
+      }
+    })
+    .then(function(alertMessage) {
+      apiutil.respond(res, 200, 'Users Alert Message', {alertMessage: alertMessage})
+    })
+  })
+  .catch(function(err) {
+    if (err !== 'busy') {
+      apiutil.internalError(res, 'Failed to get users alert message: ', err.stack)
+    }
+  })
+}
+
 function updateUserGroupsQuotas(req, res) {
   const email = req.swagger.params.email.value
   const duration =
@@ -379,6 +466,8 @@ module.exports = {
     updateUserGroupsQuotas: updateUserGroupsQuotas
   , updateDefaultUserGroupsQuotas: updateDefaultUserGroupsQuotas
   , getUsers: getUsers
+  , getUsersAlertMessage: getUsersAlertMessage
+  , updateUsersAlertMessage: updateUsersAlertMessage
   , getUserByEmail: getUserByEmail
   , getUserInfo: getUserInfo
   , createUser: createUser
diff --git a/lib/units/api/swagger/api_v1.yaml b/lib/units/api/swagger/api_v1.yaml
index 4cc50f9c..7dc2b8b8 100644
--- a/lib/units/api/swagger/api_v1.yaml
+++ b/lib/units/api/swagger/api_v1.yaml
@@ -1,10 +1,10 @@
 ##
-# Copyright © 2019 contains code contributed by Orange SA, authors: Denis Barbaron - Licensed under the Apache license 2.0
+# Copyright © 2019-2024 contains code contributed by Orange SA, authors: Denis Barbaron - Licensed under the Apache license 2.0
 ##
 
 swagger: "2.0"
 info:
-  version: "2.4.0"
+  version: "2.4.1"
   title: Smartphone Test Farm
   description: Control and manages real Smartphone devices from browser and restful apis
   license:
@@ -728,6 +728,62 @@ paths:
             $ref: "#/definitions/UnexpectedErrorResponse"
       security:
         - accessTokenAuth: []
+  /users/alertMessage:
+    x-swagger-router-controller: users
+    get:
+      summary: Gets the users alert message
+      description: The Users Alert Message endpoint returns the current alert message launched by the administrator user
+      operationId: getUsersAlertMessage
+      tags:
+        - users
+      parameters:
+        - name: fields
+          in: query
+          description: Fields query parameter takes a comma seperated list of fields. Only listed field will be return in response
+          required: false
+          type: string
+      responses:
+        "200":
+          description: Current Users Alert Message
+          schema:
+            $ref: "#/definitions/AlertMessageResponse"
+        default:
+          description: >
+            Unexpected Error:
+              * 401: Unauthorized => bad credentials
+              * 500: Internal Server Error
+          schema:
+            $ref: "#/definitions/UnexpectedErrorResponse"
+      security:
+        - accessTokenAuth: []
+    put:
+      summary: Updates the users alert message
+      description: Updates the users alert message
+      operationId: updateUsersAlertMessage
+      tags:
+        - admin
+      parameters:
+        - name: alertMessage
+          in: body
+          description: Alert message properties
+          required: true
+          schema:
+            $ref: "#/definitions/AlertMessagePayload"
+      responses:
+        "200":
+          description: Updated Users Alert Message
+          schema:
+            $ref: "#/definitions/AlertMessageResponse"
+        default:
+          description: >
+            Unexpected Error:
+              * 400: Bad Request
+              * 401: Unauthorized => bad credentials
+              * 500: Internal Server Error
+          schema:
+            $ref: "#/definitions/UnexpectedErrorResponse"
+      security:
+        - accessTokenAuth: []
   /users/groupsQuotas:
     x-swagger-router-controller: users
     put:
@@ -2270,6 +2326,49 @@ definitions:
         type: string
       user:
         type: object
+  AlertMessage:
+    type: object
+    properties:
+      activation:
+        description: Enable or disablee the alert message
+        type: string
+      data:
+        description: Alert message text to display
+        type: string
+      level:
+        description: Alert message level
+        type: string
+  AlertMessageResponse:
+    required:
+      - success
+      - description
+      - alertMessage
+    properties:
+      success:
+        type: boolean
+      description:
+        type: string
+      alertMessage:
+        $ref: '#/definitions/AlertMessage'
+  AlertMessagePayload:
+    description: Payload object for updating the alert message
+    properties:
+      activation:
+        description: Enable or disablee the alert message
+        type: string
+        enum:
+          - 'True'
+          - 'False'
+      data:
+        description: Alert message text to display
+        type: string
+      level:
+        description: Alert message level
+        type: string
+        enum:
+          - Information
+          - Warning
+          - Critical
   Token:
     type: object
     properties:
diff --git a/lib/units/groups-engine/watchers/users.js b/lib/units/groups-engine/watchers/users.js
index ce23553c..0bc48825 100644
--- a/lib/units/groups-engine/watchers/users.js
+++ b/lib/units/groups-engine/watchers/users.js
@@ -1,5 +1,5 @@
 /**
-* Copyright © 2019 code initially contributed by Orange SA, authors: Denis Barbaron - Licensed under the Apache license 2.0
+* Copyright © 2019-2024 code initially contributed by Orange SA, authors: Denis Barbaron - Licensed under the Apache license 2.0
 **/
 
 const timeutil = require('../../../util/timeutil')
@@ -33,8 +33,9 @@ module.exports = function(pushdev) {
       'email'
     , 'name'
     , 'privilege'
-    , {groups: ['quotas', 'subscribed']
-    })
+    , {groups: ['quotas', 'subscribed']}
+    , {settings: ['alertMessage']}
+    )
     .changes(), function(err, cursor) {
     if (err) {
       throw err
@@ -77,6 +78,11 @@ module.exports = function(pushdev) {
           !_.isEqual(data.new_val.groups.subscribed, data.old_val.groups.subscribed)) {
           targets.push('settings')
         }
+        else if (!_.isEqual(
+               data.new_val.settings.alertMessage
+             , data.old_val.settings.alertMessage)) {
+          targets.push('menu')
+        }
         if (targets.length) {
           sendUserChange(
             data.new_val
diff --git a/lib/wire/wire.proto b/lib/wire/wire.proto
index 1e45526a..c7b8d984 100644
--- a/lib/wire/wire.proto
+++ b/lib/wire/wire.proto
@@ -125,11 +125,21 @@ message UserGroupsField {
   repeated string subscribed = 2;
 }
 
+message AlertMessageField {
+  required string activation = 1;
+  required string data = 2;
+  required string level = 3;
+}
+
+message UserSettingsField {
+  optional AlertMessageField alertMessage = 1;
+}
 message UserField {
   required string email = 1;
   required string name = 2;
   required string privilege = 3;
   required UserGroupsField groups = 4;
+  required UserSettingsField settings = 5;
 }
 
 message UserChangeMessage {
diff --git a/res/app/components/stf/users/users-service.js b/res/app/components/stf/users/users-service.js
index ef6df566..93117248 100644
--- a/res/app/components/stf/users/users-service.js
+++ b/res/app/components/stf/users/users-service.js
@@ -1,5 +1,5 @@
 /**
-* Copyright © 2019 code initially contributed by Orange SA, authors: Denis Barbaron - Licensed under the Apache license 2.0
+* Copyright © 2019-2024 code initially contributed by Orange SA, authors: Denis Barbaron - Licensed under the Apache license 2.0
 **/
 
 const oboe = require('oboe')
@@ -28,6 +28,10 @@ module.exports = function UsersServiceFactory(
       })
   }
 
+  UsersService.getUsersAlertMessage = function() {
+    return $http.get('/api/v1/users/alertMessage')
+  }
+
   UsersService.getUsers = function(fields) {
     return $http.get('/api/v1/users?fields=' + fields)
   }
@@ -92,5 +96,10 @@ module.exports = function UsersServiceFactory(
     $rootScope.$apply()
   })
 
+  socket.on('user.menu.users.updated', function(user) {
+    $rootScope.$broadcast('user.menu.users.updated', user)
+    $rootScope.$apply()
+  })
+
   return UsersService
 }
diff --git a/res/app/menu/index.js b/res/app/menu/index.js
index 88ab1128..257e404d 100644
--- a/res/app/menu/index.js
+++ b/res/app/menu/index.js
@@ -1,5 +1,5 @@
 /**
-* Copyright © 2019 contains code contributed by Orange SA, authors: Denis Barbaron - Licensed under the Apache license 2.0
+* Copyright © 2019-2024 contains code contributed by Orange SA, authors: Denis Barbaron - Licensed under the Apache license 2.0
 **/
 
 require('./menu.css')
@@ -7,6 +7,8 @@ require('angular-cookies')
 
 module.exports = angular.module('stf.menu', [
   'ngCookies',
+  require('stf/users').name,
+  require('stf/app-state').name,
   require('stf/socket').name,
   require('stf/util/common').name,
   require('stf/nav-menu').name,
diff --git a/res/app/menu/menu-controller.js b/res/app/menu/menu-controller.js
index 62ccd7e0..3e0a191b 100644
--- a/res/app/menu/menu-controller.js
+++ b/res/app/menu/menu-controller.js
@@ -1,10 +1,12 @@
 /**
-* Copyright © 2019-2023 contains code contributed by Orange SA, authors: Denis Barbaron - Licensed under the Apache license 2.0
+* Copyright © 2019-2024 contains code contributed by Orange SA, authors: Denis Barbaron - Licensed under the Apache license 2.0
 **/
 
 module.exports = function MenuCtrl(
   $scope
 , $rootScope
+, UsersService
+, AppState
 , SettingsService
 , $location
 , $http
@@ -48,4 +50,41 @@ module.exports = function MenuCtrl(
       socket.disconnect()
     }, 100)
   }
+
+  $scope.alertMessage = {
+    activation: 'False'
+  , data: ''
+  , level: ''
+  }
+
+  if (AppState.user.privilege === 'admin') {
+    $scope.alertMessage = SettingsService.get('alertMessage')
+  }
+  else {
+    UsersService.getUsersAlertMessage().then(function(response) {
+      $scope.alertMessage = response.data.alertMessage
+    })
+  }
+
+  $scope.isAlertMessageActive = function() {
+    return $scope.alertMessage.activation === 'True'
+  }
+
+  $scope.isInformationAlert = function() {
+    return $scope.alertMessage.level === 'Information'
+  }
+
+  $scope.isWarningAlert = function() {
+    return $scope.alertMessage.level === 'Warning'
+  }
+
+  $scope.isCriticalAlert = function() {
+    return $scope.alertMessage.level === 'Critical'
+  }
+
+  $scope.$on('user.menu.users.updated', function(event, message) {
+    if (message.user.privilege === 'admin') {
+      $scope.alertMessage = message.user.settings.alertMessage
+    }
+  })
 }
diff --git a/res/app/menu/menu.css b/res/app/menu/menu.css
index 539700a0..694ce00a 100644
--- a/res/app/menu/menu.css
+++ b/res/app/menu/menu.css
@@ -1,3 +1,7 @@
+/*
+  Copyright © 2019-2024 contains code contributed by Orange SA, authors: Denis Barbaron - Licensed under the Apache license 2.0
+*/
+
 .stf-menu .stf-logo {
   background: url(../../common/logo/exports/STF-512.png) no-repeat 0 0;
   width: 32px;
@@ -65,3 +69,44 @@
   height: 44px !important;
   min-height: 44px !important;
 }
+
+.stf-menu .information-level {
+  background-color: #5bc0df;
+}
+
+.stf-menu .warning-level {
+  background-color: #f0ad4f;
+}
+
+.stf-menu .critical-level {
+  background-color: #ff4b2b;
+}
+
+.stf-menu .maintenance-banner {
+  color: #ffffff;
+  padding: 10px;
+  position: relative;
+  text-align: center;
+  overflow: hidden;
+  height: 44px;
+}
+
+.stf-menu .maintenance-banner p {
+  font-size: 18px;
+  animation: slideBanner 15s linear infinite;
+  white-space: nowrap;
+  position: relative;
+  top: 50%;
+  transform: translate(0%,-50%);
+  line-height: 44px;
+}
+
+@keyframes slideBanner {
+  0% {
+   left: 100%;
+  }
+  100% {
+   left: -100%;
+  }
+}
+
diff --git a/res/app/menu/menu.pug b/res/app/menu/menu.pug
index 49a241a0..0de1fbe1 100644
--- a/res/app/menu/menu.pug
+++ b/res/app/menu/menu.pug
@@ -1,5 +1,5 @@
 //
-  Copyright © 2019 contains code contributed by Orange SA, authors: Denis Barbaron - Licensed under the Apache license 2.0
+  Copyright © 2019-2024 contains code contributed by Orange SA, authors: Denis Barbaron - Licensed under the Apache license 2.0
 //
 
 .navbar.stf-menu(ng-controller='MenuCtrl')
@@ -19,6 +19,10 @@
         a(ng-href='/#!/settings')
           span.fa.fa-gears
           span(ng-if='!$root.basicMode', translate) Settings
+    ul.nav.stf-nav(ng-if='isAlertMessageActive()', nav-menu='current').unselectable.col-xs-5
+      li.col-xs-12
+        .maintenance-banner(ng-class="{'information-level': isInformationAlert(), 'warning-level': isWarningAlert(), 'critical-level': isCriticalAlert()}")
+          p(translate) {{ alertMessage.data }}
     ul.nav.stf-nav.stf-feedback.pull-right(ng-cloak, nav-menu='current').unselectable
       li.stf-nav-web-native-button(ng-if='!$root.basicMode && isControlRoute')
         .btn-group
diff --git a/res/app/settings/general/alert-message/alert-message-controller.js b/res/app/settings/general/alert-message/alert-message-controller.js
new file mode 100644
index 00000000..c8cf7429
--- /dev/null
+++ b/res/app/settings/general/alert-message/alert-message-controller.js
@@ -0,0 +1,41 @@
+/**
+* Copyright © 2024 code initially contributed by Orange SA, authors: Denis Barbaron - Licensed under the Apache license 2.0
+**/
+
+module.exports = function AlertMessageCtrl(
+  $scope
+, SettingsService
+) {
+
+  $scope.defaultAlertMessage = {
+    data: '*** This site is currently under maintenance, please wait ***'
+  , activation: 'False'
+  , level: 'Critical'
+  }
+
+  SettingsService.bind($scope, {
+    target: 'alertMessage'
+  , source: 'alertMessage'
+  , defaultValue: $scope.defaultAlertMessage
+  })
+
+  $scope.alertMessageActivationOptions = ['True', 'False']
+  $scope.alertMessageLevelOptions = ['Information', 'Warning', 'Critical']
+
+  $scope.$watch(
+    function() {
+      return SettingsService.get('alertMessage')
+    }
+  , function(newvalue) {
+      if (typeof newvalue === 'undefined') {
+        SettingsService.set('alertMessage', $scope.defaultAlertMessage)
+      }
+    }
+  )
+
+  $scope.$on('user.menu.users.updated', function(event, message) {
+    if (message.user.privilege === 'admin') {
+      $scope.alertMessage = message.user.settings.alertMessage
+    }
+  })
+}
diff --git a/res/app/settings/general/alert-message/alert-message.pug b/res/app/settings/general/alert-message/alert-message.pug
new file mode 100644
index 00000000..d4e01f37
--- /dev/null
+++ b/res/app/settings/general/alert-message/alert-message.pug
@@ -0,0 +1,34 @@
+//
+  Copyright © 2024 code initially contributed by Orange SA, authors: Denis Barbaron - Licensed under the Apache license 2.0
+//
+
+.widget-container.fluid-height(ng-controller='AlertMessageCtrl')
+  .heading
+    i.fa.fa-exclamation-triangle
+    span(translate) Alert Message
+  .widget-content.padded
+    .form-horizontal
+      .form-group.general-item
+        .input-group
+          .input-group-addon.input-sm
+            i.fa.fa-exclamation-triangle(
+            uib-tooltip="{{'Define your own alert message' | translate}}" tooltip-placement='auto top-right' tooltip-popup-delay='500')
+          input.form-control.input-sm(size='20' type='text' placeholder='' ng-model='alertMessage.data')
+      .form-group.general-item
+        label.general-label(
+          translate
+          uib-tooltip="{{'Alert message activation' | translate}}"
+          tooltip-placement='auto top-right'
+          tooltip-popup-delay='500') Activation
+        select(
+          ng-model='alertMessage.activation'
+          ng-options='option for option in alertMessageActivationOptions')
+      .form-group.general-item
+        label.general-label(
+          translate
+          uib-tooltip="{{'Alert message level' | translate}}"
+          tooltip-placement='auto top-right'
+          tooltip-popup-delay='500') Level
+        select(
+          ng-model='alertMessage.level'
+          ng-options='option for option in alertMessageLevelOptions')
diff --git a/res/app/settings/general/alert-message/index.js b/res/app/settings/general/alert-message/index.js
new file mode 100644
index 00000000..902f82b7
--- /dev/null
+++ b/res/app/settings/general/alert-message/index.js
@@ -0,0 +1,14 @@
+/**
+* Copyright © 2024 code initially contributed by Orange SA, authors: Denis Barbaron - Licensed under the Apache license 2.0
+**/
+
+module.exports = angular.module('stf.settings.general.alert-message', [
+  require('stf/settings').name
+])
+  .run(['$templateCache', function($templateCache) {
+    $templateCache.put(
+      'settings/general/alert-message/alert-message.pug'
+    , require('./alert-message.pug')
+    )
+  }])
+  .controller('AlertMessageCtrl', require('./alert-message-controller'))
diff --git a/res/app/settings/general/general-controller.js b/res/app/settings/general/general-controller.js
index aae72a36..0e1fcb0d 100644
--- a/res/app/settings/general/general-controller.js
+++ b/res/app/settings/general/general-controller.js
@@ -1,3 +1,9 @@
-module.exports = function GeneralCtrl() {
+/**
+*  Copyright © 2024 contains code contributed by Orange SA, authors: Denis Barbaron - Licensed under the Apache license 2.0
+**/
 
+module.exports = function GeneralCtrl($scope, AppState) {
+  $scope.isAdmin = function() {
+    return AppState.user.privilege === 'admin'
+  }
 }
diff --git a/res/app/settings/general/general.css b/res/app/settings/general/general.css
index 59dd8ad4..1cf54577 100644
--- a/res/app/settings/general/general.css
+++ b/res/app/settings/general/general.css
@@ -1,3 +1,16 @@
+/*
+  Copyright © 2024 contains code contributed by Orange SA, authors: Denis Barbaron - Licensed under the Apache license 2.0
+*/
+
 .stf-general {
 
-}
\ No newline at end of file
+}
+
+.stf-general .general-item {
+  margin: 0px 10px 15px 0px;
+}
+
+.stf-general .general-label {
+  font-weight: bold;
+  margin-right: 10px;
+}
diff --git a/res/app/settings/general/general.pug b/res/app/settings/general/general.pug
index 0fa05bdb..847b6d05 100644
--- a/res/app/settings/general/general.pug
+++ b/res/app/settings/general/general.pug
@@ -1,8 +1,9 @@
 //
-  Copyright © 2019 contains code contributed by Orange SA, authors: Denis Barbaron - Licensed under the Apache license 2.0
+  Copyright © 2019-2024 contains code contributed by Orange SA, authors: Denis Barbaron - Licensed under the Apache license 2.0
 //
 
-.row
+.div(ng-controller='GeneralCtrl')
+ .row.stf-general
   .col-md-3
     div(ng-include='"settings/general/local/local-settings.pug"')
   .col-md-3
@@ -11,3 +12,6 @@
     div(ng-include='"settings/general/date-format/date-format.pug"')
   .col-md-3
     div(ng-include='"settings/general/email-address-separator/email-address-separator.pug"')
+ .row.stf-general(ng-if='isAdmin()')
+  .col-md-12
+    div(ng-include='"settings/general/alert-message/alert-message.pug"')
diff --git a/res/app/settings/general/index.js b/res/app/settings/general/index.js
index 5033197a..768c5fd2 100644
--- a/res/app/settings/general/index.js
+++ b/res/app/settings/general/index.js
@@ -1,5 +1,5 @@
 /**
-* Copyright © 2019 contains code contributed by Orange SA, authors: Denis Barbaron - Licensed under the Apache license 2.0
+* Copyright © 2019-2024 contains code contributed by Orange SA, authors: Denis Barbaron - Licensed under the Apache license 2.0
 **/
 
 require('./general.css')
@@ -8,7 +8,9 @@ module.exports = angular.module('stf.settings.general', [
   require('./language').name,
   require('./local').name,
   require('./email-address-separator').name,
-  require('./date-format').name
+  require('./date-format').name,
+  require('stf/app-state').name,
+  require('./alert-message').name
 ])
   .run(['$templateCache', function($templateCache) {
     $templateCache.put(