At the moment we cannot block the destination port as we don't have any specific filter for this. This can be achieved by using the filter Header Value. Please see the following rule
HeaderValue != {"host";"varularora.com:443"} : This rule will block all the connections to the site user3.incaptest.net expect the port 443.
When we try to add the rule, the rule will be added like in the screenshot below.
#CloudWAF(formerlyIncapsula)