It depends what you want to do, cause I have this problem too.
httpd serves port 443
I run SSL-Explorer - a java VPN solution. It works over https really well on a specified port. But the proxy I use from work only allows https connections on port 443 (initial connection only, I guess). So I can't use SSL-Explorer without moving httpd off port 443
I have to keep horde running for other people, but I would love to access SSL-Explorer as well.
The only thing I can think of is some firewall or mod_rewrite trickery that does something like
ssl.mydomain.com:443 -> mydomain.com:28081
webmail.mydomain.com -> mydomain.com/webmail:443
Maybe some SSL proxy solution may suggest itself that I can stick on port 443 and handle the redirections
Of course, this is SSL, so this sort of jiggery-pokery will probably break the security model.
Si