Hi the above both properties are the properties which are used for configuration of BigFix Web reports. To use Web reports securely you have to configure few properties. The above two properties are few of them.
_WebReports_HTTPServer_PortNumber - This property basically sets the port number on which your bigfix web report server will communicate with all the endpoints and give you the various data into BigFix web reports.
_Webreports_HTTPRedirect_PortNumber - This property basically redirects the endpoint which are communicating on HTTP to HTTPS.
But before adding this property, we need to add _WebReports_HTTPRedirect_Enabled property and give the value as 1 for it.
For more info please go to the below link which will answer all your above query: