If you are the site owner, your site was probably removed from the service because it is in violation of our terms of service or if it is under a DDoS attack and your service plan does not cover DDoS mitigation. You should point your domain DNS entries back to the original IPs as soon as possible as Incapsula will no longer service requests for this site. If you keep your records pointing to Incapsula it will have a negative effect on your search engine ranking.