*Mar 1 06:58:21.182: ISAKMP/xauth: Expected attribute XAUTH_USER_NAME_V2 not received
Note it says that it didn't receive a username from the PIX. This is probably bug CSCea19586, you cna either run 12.2(8)T on the router and it should work, or if you're running 12.2(13)T or higher on the router, upgrade the PIX to 6.3(1) and it should work also. There's basically an incompatibility between 6.2(2) and higher than 12.2(8)T, so change either side and it should work for you.
The IOS I am using is 12.3(1a). I will upgrade the pix to 6.3(1) and let you know how it went.
Meanwhile, I tried the same PIX 501 (6.2(2)) to act as a VPN hardware client, with a VPN concentrator 3000 at the other end, pushing the configurations. The VPN concentrator shows the following error logs.
Usually means there's no filter applied to the Public interface (I know the message refers to Interface 1 which is the Private, but hey). It's quite valid (and the default actually) to have no filter applied to the Private interface, so that shouldn't be the issue. It's not valid however, to have no filter applied to the Public interface, so make sure that has the Public/default filter applied to it and try again.
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...