I can't add a widget for logging in via VKontakte, why?

Question

In contact with

I can't add a widget for logging in via VKontakte.
https://vk.com/dev/Auth
Test site.
I enter http://address:5555/test.php
into the site address. Base domain: address:5555 I
assigned the domain via DDNS service .
in app settings, or use widget only in address/*”
I can’t set the usual port 80 - it’s blocked by the provider.
I tried to drive in local addresses there - I get Bad Url and is not saved

Answer 1

The contact widget can only be placed on a normal domain.