is this for sFTP, we are tring to get FTPES working ? would that be different ?
I believe the issue is, as it stands now because it is a passive connection so it is coming in on port 21 then when it is asked to open up a data channel on another port it fails. Most firewalls will inspect the first packets that come in and dynamically open the data port but since it is encrypted it cannot do this. I can specify the data ports that FTP is allowed opening but it is still not getting though, the firewall must be doing more inspection of these packets and denying them.
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...
[toc:faq]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 and UDP are I...