While playing with SSL certs on View servers I found one of my Connection servers would start all of its services, but not start listening on 443. Note that netstat can be used to determine if something listening on 443: C:\Users\administrator>netstat...

Every year of use of an Exchange 2007 CAS server, you need to renew the self signed certificate... Here is an article explaining how to do it : Exchange Server 2007 issues itself a self-signed certificate for use with services like SMTP, IMAP, POP, IIS...