From the output check especially what the NAT phases of the packet-tracer say.
Also you can use the graphical user interface ASDM to check the realtime monitor/logging to show what happens to the TCP connection. (For example if the connection is torn down because of SYN timeout or perhaps just TCP Reset)
And if you want to go even more deeper you can create a traffic capture on the ASAs outside interface for this traffic and view the capture on Wireshark for example to see whats happening on the connection.
PS. I guess you have changed you configurations abit since your attached configuration and the outside interface mentioned in the replys are different (
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...