diff --git a/lib/Froxlor/UI/Panel/UI.php b/lib/Froxlor/UI/Panel/UI.php
index 10ee15e9..d7fc0d25 100644
--- a/lib/Froxlor/UI/Panel/UI.php
+++ b/lib/Froxlor/UI/Panel/UI.php
@@ -95,7 +95,7 @@ class UI
 		session_set_cookie_params([
 			'lifetime' => self::$install_mode ? 7200 : 600, // will be renewed based on settings in lib/init.php
 			'path' => '/',
-			'domain' => $_SERVER['SERVER_NAME'],
+			'domain' => explode(':', $_SERVER['HTTP_HOST'])[0],
 			'secure' => self::requestIsHttps(),
 			'httponly' => true,
 			'samesite' => 'Strict'
diff --git a/lib/init.php b/lib/init.php
index 16170a01..cf683be6 100644
--- a/lib/init.php
+++ b/lib/init.php
@@ -332,7 +332,7 @@ if (CurrentUser::hasSession()) {
 	$cookie_params = [
 		'expires' => time() + Settings::Get('session.sessiontimeout'),
 		'path' => '/',
-		'domain' => $_SERVER['SERVER_NAME'],
+		'domain' => explode(':', $_SERVER['HTTP_HOST'])[0],
 		'secure' => UI::requestIsHttps(),
 		'httponly' => true,
 		'samesite' => 'Strict'