InstructionGo to: Application Firewall >> Reverse Proxy and click at the top of the Mapping column on the + sign.Choose New from template >> ActiveSync, which matches your ActiveSync version.The following mappings, based upon the template, have been created:-Exchange ActiveSync-Exchange AutodiscoverGo to: Application Firewall >> Reverse ProxyConnect the new ActiveSync mappings with the corresponding virtual host.Corresponding virtual host: exchange.ext.virtinc.comConnect the new ActiveSync mappings to the corresponding back-end group.The mappings have been established and can be activated.