When you have authentication problems, you can perform a connectivity test to check for connectivity issues. You can enter the hostname or the IP address of the network device that you are trying to connect with and execute the following commands from the web interface: ping , traceroute , and nslookup .
For step by step process, please go through the following link:
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...