diff --git a/include/dba.php b/include/dba.php
index 1fe4cab400..6446bb444b 100644
--- a/include/dba.php
+++ b/include/dba.php
@@ -1,5 +1,6 @@
 <?php
 
+use Friendica\App;
 use Friendica\Core\L10n;
 use Friendica\Core\System;
 use Friendica\Database\DBM;
@@ -24,7 +25,7 @@ class dba {
 	private static $in_transaction = false;
 	private static $relation = [];
 
-	public static function connect($serveraddr, $user, $pass, $db, $install = false) {
+	public static function connect($serveraddr, $user, $pass, $db) {
 		if (!is_null(self::$db)) {
 			return true;
 		}
@@ -51,7 +52,7 @@ class dba {
 			return false;
 		}
 
-		if ($install) {
+		if ($a->mode == App::MODE_INSTALL) {
 			// server has to be a non-empty string that is not 'localhost' and not an IP
 			if (strlen($server) && ($server !== 'localhost') && filter_var($server, FILTER_VALIDATE_IP) === false) {
 				if (! dns_get_record($server, DNS_A + DNS_CNAME)) {
diff --git a/include/text.php b/include/text.php
index 23ce0f3d78..a37d5815d5 100644
--- a/include/text.php
+++ b/include/text.php
@@ -637,7 +637,7 @@ function logger($msg, $level = 0) {
 
 	// turn off logger in install mode
 	if (
-		$a->mode == APP_MODE_INSTALL
+		$a->mode == App::MODE_INSTALL
 		|| !dba::$connected
 	) {
 		return;
@@ -709,7 +709,7 @@ function dlogger($msg, $level = 0) {
 
 	// turn off logger in install mode
 	if (
-		$a->mode == APP_MODE_INSTALL
+		$a->mode == App::MODE_INSTALL
 		|| !dba::$connected
 	) {
 		return;
diff --git a/index.php b/index.php
index d45704c937..717ae41c0e 100644
--- a/index.php
+++ b/index.php
@@ -32,7 +32,7 @@ BaseObject::setApp($a);
 $a->backend = false;
 
 // Only load config if found, don't suppress errors
-if (!$a->mode == APP_MODE_INSTALL) {
+if (!$a->mode == App::MODE_INSTALL) {
 	include ".htconfig.php";
 }
 
@@ -42,7 +42,7 @@ if (!$a->mode == APP_MODE_INSTALL) {
 
 require_once "include/dba.php";
 
-if (!$a->mode == APP_MODE_INSTALL) {
+if (!$a->mode == App::MODE_INSTALL) {
 	$result = dba::connect($db_host, $db_user, $db_pass, $db_data);
 	unset($db_host, $db_user, $db_pass, $db_data);
 
@@ -77,7 +77,7 @@ if (!$a->mode == APP_MODE_INSTALL) {
 	Addon::loadHooks();
 	Addon::callHooks('init_1');
 
-	$a->mode = ((Config::get('system', 'maintenance')) ? APP_MODE_MAINTENANCE : APP_MODE_NORMAL);
+	$a->checkMaintenanceMode();
 }
 
 $lang = L10n::getBrowserLanguage();
@@ -121,7 +121,7 @@ if ((x($_SESSION, 'language')) && ($_SESSION['language'] !== $lang)) {
 	L10n::loadTranslationTable($lang);
 }
 
-if ((x($_GET, 'zrl')) && $a->mode == APP_MODE_NORMAL) {
+if ((x($_GET, 'zrl')) && $a->mode == App::MODE_NORMAL) {
 	// Only continue when the given profile link seems valid
 	// Valid profile links contain a path with "/profile/" and no query parameters
 	if ((parse_url($_GET['zrl'], PHP_URL_QUERY) == "")
@@ -173,9 +173,9 @@ $_SESSION['last_updated'] = defaults($_SESSION, 'last_updated', []);
 
 // in install mode, any url loads install module
 // but we need "view" module for stylesheet
-if ($a->mode == APP_MODE_INSTALL && $a->module!="view") {
+if ($a->mode == App::MODE_INSTALL && $a->module!="view") {
 	$a->module = 'install';
-} elseif ($a->mode == APP_MODE_MAINTENANCE && $a->module!="view") {
+} elseif ($a->mode == App::MODE_MAINTENANCE && $a->module!="view") {
 	$a->module = 'maintenance';
 } else {
 	check_url($a);
@@ -334,7 +334,7 @@ if (! x($a->page, 'content')) {
 	$a->page['content'] = '';
 }
 
-if ($a->mode == APP_MODE_NORMAL) {
+if ($a->mode == App::MODE_NORMAL) {
 	Addon::callHooks('page_content_top', $a->page['content']);
 }
 
diff --git a/mod/install.php b/mod/install.php
index 3b09da6e4a..4596f9a251 100644
--- a/mod/install.php
+++ b/mod/install.php
@@ -51,7 +51,7 @@ function install_post(App $a) {
 			$phpath = notags(trim($_POST['phpath']));
 
 			require_once("include/dba.php");
-			if (!dba::connect($dbhost, $dbuser, $dbpass, $dbdata, true)) {
+			if (!dba::connect($dbhost, $dbuser, $dbpass, $dbdata)) {
 				$a->data['db_conn_failed'] = true;
 			}
 
@@ -70,7 +70,7 @@ function install_post(App $a) {
 			$rino = 1;
 
 			// connect to db
-			dba::connect($dbhost, $dbuser, $dbpass, $dbdata, true);
+			dba::connect($dbhost, $dbuser, $dbpass, $dbdata);
 
 			Install::install($urlpath, $dbhost, $dbuser, $dbpass, $dbdata, $phpath, $timezone, $language, $adminmail, $rino);
 
diff --git a/src/App.php b/src/App.php
index 4ad3f62b63..b285218f48 100644
--- a/src/App.php
+++ b/src/App.php
@@ -14,10 +14,6 @@ use Detection\MobileDetect;
 
 use Exception;
 
-define ('APP_MODE_NORMAL', 0);
-define ('APP_MODE_INSTALL', 1);
-define ('APP_MODE_MAINTENANCE', 2);
-
 require_once 'boot.php';
 require_once 'include/text.php';
 
@@ -36,6 +32,10 @@ require_once 'include/text.php';
  */
 class App
 {
+	const MODE_NORMAL = 0;
+	const MODE_INSTALL = 1;
+	const MODE_MAINTENANCE = 2;
+
 	public $module_loaded = false;
 	public $module_class = null;
 	public $query_string;
@@ -56,7 +56,7 @@ class App
 	public $argv;
 	public $argc;
 	public $module;
-	public $mode = APP_MODE_NORMAL;
+	public $mode = App::MODE_NORMAL;
 	public $pager;
 	public $strings;
 	public $basepath;
@@ -298,7 +298,7 @@ class App
 		 * Ignore errors. If the file doesn't exist or is empty, we are running in
 		 * installation mode.	 *
 		 */
-		$this->mode = ((file_exists('.htconfig.php') && filesize('.htconfig.php')) ? APP_MODE_NORMAL : APP_MODE_INSTALL);
+		$this->mode = ((file_exists('.htconfig.php') && filesize('.htconfig.php')) ? App::MODE_NORMAL : App::MODE_INSTALL);
 
 
 		self::$a = $this;
@@ -1080,4 +1080,19 @@ class App
 
 		return $sender_email;
 	}
+
+	/**
+	 * @note Checks, if the App is in the Maintenance-Mode
+	 *
+	 * @return boolean
+	 */
+	public function checkMaintenanceMode()
+	{
+		if (Config::get('system', 'maintenance')) {
+			$this->mode = App::MODE_MAINTENANCE;
+			return true;
+		}
+
+		return false;
+	}
 }
diff --git a/src/Core/Console/AutomaticInstallation.php b/src/Core/Console/AutomaticInstallation.php
index ff27782302..e08491b805 100644
--- a/src/Core/Console/AutomaticInstallation.php
+++ b/src/Core/Console/AutomaticInstallation.php
@@ -137,7 +137,7 @@ HELP;
 		);
 
 
-		if (!dba::connect($db_host, $db_user, $db_pass, $db_data, true)) {
+		if (!dba::connect($db_host, $db_user, $db_pass, $db_data)) {
 			$result['status'] = false;
 			$result['help'] = 'Failed, please check your MySQL settings and credentials.';
 		}
diff --git a/src/Core/Install.php b/src/Core/Install.php
index 56e423595d..ad600a70a2 100644
--- a/src/Core/Install.php
+++ b/src/Core/Install.php
@@ -5,6 +5,7 @@
 namespace Friendica\Core;
 
 use Friendica\BaseObject;
+use Friendica\App;
 use Friendica\Database\DBStructure;
 use Friendica\Object\Image;
 use Friendica\Util\Network;
@@ -18,7 +19,7 @@ use DOMDocument;
 class Install extends BaseObject
 {
 	public static function setInstallMode() {
-		self::getApp()->mode = APP_MODE_INSTALL;
+		self::getApp()->mode = App::MODE_INSTALL;
 	}
 
 	public static function check($phpath = 'php')