We have five public IP Addresses. I added each of them as an alias to the WAN connection. I can forward ports such as mail, and ssh, etc on the main WAN IP but I cannot for any of the alias.

So lets say my first alias IP is .25 how can I forward port 443 from that public ip alias to a private machine on the LAN?

Thanks!

Depending on how they are routed, you may have to add the second static IP to the 2nd IP For IP Routing Usage in the LAN settings.