The IP Address you assign to the http://computername/site in the (IIS) Site Binding MUST match the IP assign to the NIC for the site. For example: Inside Site Binding configuration, you will have: Type---http, Port----80, IP---0.0.0.0, whatever the Ip of the NIC configured inside your control panel/networking/IPv4. This IP must also be the same assigned by the company that host the website. Check your configuration.