AP Adoption - port 443 on firewall

[knut_jakobsen_h]

Hi, 

I have a vSZ server running on a remote location. For my AP to access my vSZ over internet, I've port forwarded a lot of ports.. BUT.. not 443, because I already use 443 on another server/service..

is port 443 necessary for AP adoption in to the vSZ?
Or can I use alternate port?