check SSL certificate with key

openssl rsa -noout -modulus -in file.key
openssl req -noout -modulus -in file.csr
openssl x509 -noout -modulus -in file.cer

check the outputs

selinux show allowed ports of apache

on centos 6.5:

# sudo semanage port -l | grep http
http_cache_port_t              tcp      3128, 8080, 8118, 8123, 10001-10010
http_cache_port_t              udp      3130
http_port_t                    tcp      80, 81, 443, 488, 8008, 8009, 8443, 9000
pegasus_http_port_t            tcp      5988
pegasus_https_port_t           tcp      5989