Hi Mark,
Apache runs on the daemon (service) called httpd. There is not a separate daemon for SSL. This is more than likely a firewall issue. Please check that you have opened up TCP port 443 on the local firewall.
If you're using the GUI in CentOS 5.8, access: System > Administration > Security Level and Firewall. Ensure that Secure WWW (HTTPS) is enabled as a trusted service.
If using command line, run the following commands:
iptables -A INPUT -p tcp --dport 443 -j ACCEPT
service iptables save
service iptables restart
Also, to verify that Apache is listening on TCP port 443 (regardless of firewall settings- this is not a firewall test), run the following command:
netstat -ln | grep :443
For further assistance with networking issues, please refer to the CentOS documentation
Let me know if this resolves your issue
Andrew