If you are attempting to complete an order through your liveSite and are using a payment gateway, then you may need to use a proxy. For example, if your web server is located behind a firewall that is preventing bi-directional communication with your payment gateway, you will need route your communication through a proxy.
To tell liveSite to use a proxy to communicate with your payment gateway, please enter a valid Proxy IP Address on the Site Settings.
NOTE: The use of a proxy is usually necessary if your are hosting liveSite on Godaddy.com servers. Typically, the following proxy address works for the GoDaddy network: proxy.shr.secureserver.net:3128. If not, please contact your Network Administrator or Hosting Provider for more information.