That appears to be an attempt to use 126.96.36.199 as an open web proxy. Unfortunately, scans for open proxies are pretty much a constant thing. You really need to figure out if they were successful (the scans will occur whether successful or not). I would suggest:
1) evaluate the actual web server logs to determine whether they were successful.
2) setup a browser on an external host with that IP address as a proxy. does it work(if you request yahoo.com, does it return yahoo.com)?
doh! just saw that you got some answers already. must have gotten a cached page.
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...