Como testar:
Invoke-WebRequest -UserAgent "_zbot" http://localhost/phpbb/index.php
Invoke-WebRequest -Headers @{"Referer" = "http://000Free.us"} http://localhost/phpbb/index.php
Invoke-WebRequest -Headers @{"X-Forwarded-For" = "1.180.70.178"} -Uri http://mundophpbb.com.br/phpBB3