Check_mk continues to use to date (December 2014) the old python module for Apache mod_python than is discontinued now. It is a module that started to discard distributions for the more update mod_wsgi module. The more new versions of the most popular linux distros do not include this module so if you need it you’ll have to compile it yourself.
This may change so before compiling looking if there is already a package for your linux distro.
Tests in this posts were made with with SELINUX disabled. Careful with Firewalld so you can access your 80 port too.