Thanks, the option with Apache is too expensive at this moment in terms of development and maintenance.
Also, AIX does not have iptables so we are looking for another way to do this.
Any other suggestions or is there no other way than suggested in the documentation (to which the url refers)?
Isn't there some way, other than iptables, to do port forwarding in AIX?
I know that there are some AIX users out there, perhaps one of them might offer some help?