diff --git a/install/tpl/apache_ispconfig.vhost.master b/install/tpl/apache_ispconfig.vhost.master
index 0d12694f7ae57b57f1a24c4407b37d45d9ae9492..e38e39a8e1f2e10ab170ebf3cc5248029c15255a 100644
--- a/install/tpl/apache_ispconfig.vhost.master
+++ b/install/tpl/apache_ispconfig.vhost.master
@@ -112,4 +112,8 @@ NameVirtualHost *:<tmpl_var name="vhost_port">
   <tmpl_var name="ssl_comment">SSLStaplingResponderTimeout 5
   <tmpl_var name="ssl_comment">SSLStaplingReturnResponderErrors Off
   </tmpl_if>
+
+  # Redirect http to https
+  ErrorDocument 400 "<script>document.location.href='https://'+location.hostname+':'+location.port';</script><h1>Error 400 - trying to redirect</h1>"
+
 </VirtualHost>