Two Servers, internal and external with ActiveDirectory Support?

Hello,

i want to use a internal openfire server with activedirectory support to use for my internal users.

i read here that it is possible and i will try it next week.

i also want to use a ssl certificate which is sign from my CA from my active directory.

is this possible?

and, last but not lease,

i would use a seperate server in our dmz for external access from mobile-devices.

the external server should connect to the internal server to communicate with my users.

is this possible, too?

thank you.

best regards