ANSWER: Their IP address or network may be blocked by our firewall. Please have your client go to: http://www.ipchicken.com(the ipchicken website is not affiliated with After Dark Grafx) to get their IP address. Once you have their IP address just email it to our support department and we will determine whether they are on an offending network and either allow or deny their access. Since all of our servers and service is located in the U.S. we have some restrictions on who can view or not view our websites. This is for the overall security off all of our clients and our networks. In the event that this is a significant issue, we can move your website to a server outside of our network (additional fees will apply)