How are trying to login into the FTP server? The sensor is counting failed login attempts inside of the same connection (TCP stream). So, if you are attempting to login and disconnect between attempts, then this might explain the lack of alarms. A traffic sample should be able to clear this up if it's still not working. You can send them to firstname.lastname@example.org if you'd like us to look at 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...