Artigo publicado no TechNet Wiki : http://social.technet.microsoft.com/wiki/contents/articles/6534.aspx

Mensagem de erro “The Internet interface must not be classified as a domain network” na Instalação.
O cliente DirectAccess não tem acesso à rede interna
The current security context is not associated or accessible to Active Directory Domain Services
The DirectAccess Server requires an identify certificate to be installed locally
Windows firewall is blocking network traffic required for teredo connectivity