My ASA 8.0.4 is working fine for UDP-over-IPSEC connectinos. However TCP-over-IPSEC over 443 is not working. I did configure port 443 in the ASA. ASDM error I get:(although i am not sure this has anything to do with it) Duplicate phase 2 packet detected.
It changes any connection via the VPN Remote client/Hardware Client - where the remote end NAT device does not support/understand NAT-T/VPN PassThru. It also enables you to allow IPSEC connections on ISP/3rd Party/Provider networks, that block the normal RFC NAT-T UDP 4500.
The port can be changed from 10000 to whatever you want, if you have a firewall that sites in front of the VPN device, the TCP port must be allowed thru.
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...