Fix that the ldap port does not change when updating the encryption to use

fixes #8958

application/forms/Config/Resource/LdapResourceForm.php

@@ -27,6 +27,10 @@ class LdapResourceForm extends Form
      */
     public function createElements(array $formData)
     {
+        $defaultPort = ! array_key_exists('encryption', $formData) || $formData['encryption'] !== Connection::LDAPS
+            ? 389
+            : 636;
+
         $this->addElement(
             'text',
             'name',
@@ -53,9 +57,10 @@ class LdapResourceForm extends Form
             'port',
             array(
                 'required'          => true,
+                'preserveDefault'   => true,
                 'label'             => $this->translate('Port'),
                 'description'       => $this->translate('The port of the LDAP server to use for authentication'),
-                'value'         => 389
+                'value'             => $defaultPort
             )
         );
         $this->addElement(