The requested URL could not be retrieved proxy não navega

Boa noite!

Estou a quase uma semana com um problema no meu server

Utilizo proxy autenticado pelo AD

Tenho 2 politicas, uma que bloqueia tudo e outra que bloqueia apenas alguns sites … o meu problema é que só uma dessas politicas funciona, quando tento navegar aparece o seguinte erro

The requested URL could not be retrieved

While trying to retrieve the URL: http://google.com/

The following error was encountered:

Unable to forward this request at this time.

Sorry, you are not currently allowed to request:

http://google.com/

from this cache until you have authenticated yourself.

This request could not be forwarded to the origin server or to any

parent caches. The most likely cause for this error is that:

The cache administrator does not allow this cache to make direct connections to origin servers, and

All configured parent caches are currently unreachable.

Your cache administrator is webmaster.

Alguem sabe o que pode ser? Preciso resolver urgente

Obrigado