Hi elemer_k,
If the compatibility matrix explicitly says that Apache 2.4 is supported only with our RHEL7 builds, please take our word for it.
It doesn’t mean that Apache 2.4 and RHEL 6.8 hosted Campaign will not work. It might work. Problem is if you started to observe unwanted behaviour on Campaign, Adobe won’t be able to help as it is an unsupported configuration.
Hope this helps.
Regards,
Vipul Raghav