For Foglight for Apache cartridge prior to version 5.8.0, the agent only makes two requests - one for mod_status and one for mod_info (Monitoring Apache Web Servers User and Reference Guide). Check with the Apache administrator if it is possible to configure Apache to make these available via HTTP only. The other option is to install the Apache agent on a local Foglight Agent Manager (FglAM) and configure Apache to enable local traffic to access via HTTP.
Issue fixed in version 5.8.0. The latest version of Foglight for Apache cartridge can be downloaded here.