if you could post pix interface stats we could see if there are any errors.
telnet to pix and issue these two commands bellow, strip out any public IP address information.
show interface ethernet0
show interface ethernet1
make sure the pix ethernet connections are hard coded on both ends, e.g if your pix inside interface connects to a switch make sure the switport is also 100/full duplex hard coded, same for your outside interface.
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...