Apache is unable to start due to '/etc/httpd/modules/mod_slotmem.so: cannot open shared object file: Permission denied'

Issue

• when attempting to start apache the following error is thrown:

Starting httpd: httpd: Syntax error on line 221 of /etc/httpd/conf/httpd.conf: Syntax error on line 1 of /etc/httpd/conf.d/mod_cluster.conf: Cannot load /etc/httpd/modules/mod_slotmem.so into server: /etc/httpd/modules/mod_slotmem.so: cannot open shared object file: Permission denied