As long as I know, there is no official document about "error message" from Remote Client (Software or Hardware VPN3002) or the Concentrator itself. May be I am not looking to deep on the document, so please correct me if I am wrong.
In the other hand, for troubleshooting, I found out that increasing the debug level (1-13) on Event`s setting does help a lot on pinpoint a problem.
The issue I run into is people who go to hotels or offices around the globe who might have difficulty getting into VPN. It's like playing blind mans bluff to help the folks when you have no clue as to the network topology at these places - the hardware mfr, protocols in use, firewall rules, NATting, Proxying etc etc. If there was a document that said "if you see this on the client side you'd probably running into ___" that'd be a help. But for example the clients might see "Peer terminated session"...which doesn't tell them a whole lot.
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...