The PIX/ASA does not support secondary ip addresses in interfaces nor looback, but if you are attempting of geting additional Ip block from your current ISP provider different from what you currently have you simply route the new block in your edge router or ISP router back to your PIX outside interface and create your nat pools or statics with new ip block in the pix .
Is this what you are trying to accomplish? if not please clarify.
Have you confirmed with the ISP the new ip block is being routed towards PIX outside interface Ip address? beside doing that, you can always from outside do a trace route towards the New Nated IP address you have configured, the last hop should be your PIX oustide interface or you will probably see a loop at ISP router Ip if not being routed properly.
also make sure the host you have for https is indeed listening to port 443.
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...