config.php: login with admin/admin on 127.0.0.1

Exception Object
(
    [message:protected] => Error logging in to vboxwebsrv.
    [string:Exception:private] =>
    [code:protected] => 64
    [file:protected] => C:\xampp\htdocs\endpoints\api.php
    [line:protected] => 134
    [trace:Exception:private] => Array
        (
        )

    [previous:Exception:private] =>
)

config.php: login with var $noAuth = true:

An error occurred communicating with your vboxwebsrv. No more requests will be sent by phpVirtualBox until the error is corrected and this page is refreshed. The details of this connection error should be displayed in a subsequent dialog box.

host changed to ip adress:

Exception Object
(
    [message:protected] => Could not connect to host (http://192.168.1.138:18083/)
    [string:Exception:private] =>
    [code:protected] => 64
    [file:protected] => C:\xampp\htdocs\endpoints\api.php
    [line:protected] => 134
    [trace:Exception:private] => Array
        (
        )

    [previous:Exception:private] =>