diff --git a/application/forms/Config/UserBackend/LdapBackendForm.php b/application/forms/Config/UserBackend/LdapBackendForm.php
index df6e0a4c4..2402c9a6a 100644
--- a/application/forms/Config/UserBackend/LdapBackendForm.php
+++ b/application/forms/Config/UserBackend/LdapBackendForm.php
@@ -92,17 +92,19 @@ class LdapBackendForm extends Form
             'text',
             'filter',
             array(
-                'allowEmpty'    => true,
-                'label'         => $this->translate('LDAP Filter'),
-                'description'   => $this->translate(
+                'preserveDefault'   => true,
+                'allowEmpty'        => true,
+                'value'             => $isAd ? '!(objectClass=computer)' : null,
+                'label'             => $this->translate('LDAP Filter'),
+                'description'       => $this->translate(
                     'An additional filter to use when looking up users using the specified connection. '
                     . 'Leave empty to not to use any additional filter rules.'
                 ),
-                'requirement'   => $this->translate(
+                'requirement'       => $this->translate(
                     'The filter needs to be expressed as standard LDAP expression.'
                     . ' (e.g. &(foo=bar)(bar=foo) or foo=bar)'
                 ),
-                'validators'    => array(
+                'validators'        => array(
                     array(
                         'Callback',
                         false,
diff --git a/modules/setup/application/forms/AuthBackendPage.php b/modules/setup/application/forms/AuthBackendPage.php
index bb68792a6..7590d2f73 100644
--- a/modules/setup/application/forms/AuthBackendPage.php
+++ b/modules/setup/application/forms/AuthBackendPage.php
@@ -78,6 +78,23 @@ class AuthBackendPage extends Form
                 'Before you are able to authenticate using the LDAP connection defined earlier you need to'
                 . ' provide some more information so that Icinga Web 2 is able to locate account details.'
             ));
+            $this->addElement(
+                'select',
+                'type',
+                array(
+                    'ignore'            => true,
+                    'required'          => true,
+                    'autosubmit'        => true,
+                    'label'             => $this->translate('Backend Type'),
+                    'description'       => $this->translate(
+                        'The type of the resource being used for this authenticaton provider'
+                    ),
+                    'multiOptions'      => array(
+                        'ldap'      => 'LDAP',
+                        'msldap'    => 'ActiveDirectory'
+                    )
+                )
+            );
         } else { // $this->config['type'] === 'external'
             $backendForm = new ExternalBackendForm();
             $backendForm->createElements($formData);