Server Fault http://serverfault.com/questions/578069/ssl-library-error-8181-certificate-has-expired
1st. Remove nss.conf from /etc/httpd/conf.d (this will cause mod_nss to not be loaded).
2nd. Uninstall/re-install your nss rpm modules. On re-installation a new certificate will be generated and your problem will go away for a few more years :
rpm -e mod_nss
rm /etc/httpd/alias/*
yum install mod_nss
service httpd restart
Now it should work no problem at all.