diff --git a/app/controllers/configurations_controller.rb b/app/controllers/configurations_controller.rb
--- a/app/controllers/configurations_controller.rb
+++ b/app/controllers/configurations_controller.rb
@@ -5,8 +5,8 @@
 
 
   def index
-    @configurations = GraderConfiguration.find(:all,
-                                         :order => '`key`')
+    @configurations = GraderConfiguration.order(:key)
+    @group = GraderConfiguration.pluck("grader_configurations.key").map{ |x| x[0...(x.index('.'))] }.uniq.sort
   end
 
   def reload
@@ -16,8 +16,9 @@
 
   def update
     @config = GraderConfiguration.find(params[:id])
+    User.clear_last_login if @config.key == GraderConfiguration::MULTIPLE_IP_LOGIN_KEY and @config.value == 'true' and params[:grader_configuration][:value] == 'false'
     respond_to do |format|
-      if @config.update_attributes(params[:grader_configuration])
+      if @config.update_attributes(configuration_params)
         format.json { head :ok }
       else
         format.json { respond_with_bip(@config) }
@@ -25,4 +26,9 @@
     end
   end
 
+private
+  def configuration_params
+    params.require(:grader_configuration).permit(:key,:value_type,:value,:description)
+  end
+
 end