diff --git a/server/src/uds/core/util/Config.py b/server/src/uds/core/util/Config.py
index 4763c5537..4dc581bec 100644
--- a/server/src/uds/core/util/Config.py
+++ b/server/src/uds/core/util/Config.py
@@ -254,7 +254,7 @@ class GlobalConfig(object):
     # Time betwen checks of unused services by os managers
     # Unused services will be invoked for every machine assigned but not in use AND that has been assigned at least this time
     # (only if os manager asks for this characteristic)
-    CHECK_UNUSED_TIME = Config.section(GLOBAL_SECTION).value('checkUnusedTime', '631', type=Config.TEXT_FIELD)  # Defaults to 10 minutes
+    CHECK_UNUSED_TIME = Config.section(GLOBAL_SECTION).value('checkUnusedTime', '631', type=Config.NUMERIC_FIELD)  # Defaults to 10 minutes
     # Default CSS Used
     CSS = Config.section(GLOBAL_SECTION).value('css', settings.STATIC_URL + 'css/uds.css', type=Config.TEXT_FIELD)
     # Max logins before blocking an account
@@ -318,6 +318,9 @@ class GlobalConfig(object):
     # This is used so templates can change "styles" from admin interface
     UDS_THEME_VISUAL = Config.section(GLOBAL_SECTION).value('UDS Theme Enhaced', '1', type=Config.BOOLEAN_FIELD)
 
+    # Custom message for error when limiting by calendar
+    LIMITED_BY_CALENDAR_TEXT = Config.section(GLOBAL_SECTION).value('Calendar access denied text', '', type=Config.TEXT_FIELD)  # Defaults to Nothing
+
     initDone = False
 
     @staticmethod
diff --git a/server/src/uds/templates/uds/html5/index.html b/server/src/uds/templates/uds/html5/index.html
index c567f31bc..05ca67810 100644
--- a/server/src/uds/templates/uds/html5/index.html
+++ b/server/src/uds/templates/uds/html5/index.html
@@ -3,6 +3,7 @@
 {% block title %}{% trans 'Available services list' %}{% endblock %}
 
 {% block body %}
+        {% calendar_denied_msg as calendarCustomMessage %}
         {% if groups|length > 1 %}
         <ul class="nav nav-tabs nav-justified" id="services-tabs">
         {% for grp in groups %}
@@ -29,7 +30,7 @@
                              {% if ser.maintenance %}
                              data-content="{% trans "Under maintenance" %}"
                              {% elif ser.not_accesible %}
-                             data-content="{% trans "Access limited by calendar" %}"
+                             data-content="{{ calendarCustomMessage }}"
                              {% elif ser.to_be_replaced %}
                              data-content="{{ ser.to_be_replaced_text }}"
                              {% elif ser.in_use %}
@@ -102,7 +103,8 @@
                 <h4 class="modal-title">{% trans "Service access not allowed" %}</h4>
               </div>
               <div class="modal-body text-center">
-                <p>{% trans "This service is currently not accesible due to schedule restrictions" %}</p>
+                <p>{% trans "This service is currently not accesible due to schedule restrictions." %}</p>
+                <p><b>{{ calendarCustomMessage }}</b></p>
                 <p>{% trans "Please, retry access in a while." %}</p>
               </div>
               <div class="modal-footer">
diff --git a/server/src/uds/templatetags/html5.py b/server/src/uds/templatetags/html5.py
index 6b2655a5f..43247e56e 100644
--- a/server/src/uds/templatetags/html5.py
+++ b/server/src/uds/templatetags/html5.py
@@ -35,6 +35,7 @@ from __future__ import unicode_literals
 from django import template
 from django.utils.translation import ugettext as _
 from django.templatetags.static import static
+from django.utils.html import mark_safe
 
 from uds.core.util import html
 from uds.core.auths.auth import ROOT_ID
@@ -165,6 +166,13 @@ def root_id():
 def image_size():
     return Image.MAX_IMAGE_SIZE
 
+@register.assignment_tag
+def calendar_denied_msg():
+    text = GlobalConfig.LIMITED_BY_CALENDAR_TEXT.get().strip()
+    if text == '':
+        text = _("Access limited by calendar")
+
+    return text
 
 # Browser related
 class IfBrowser(template.Node):