Protocol 47 is GRE which is used in PPTP VPN connections. If this inside user has a static one-to-one translation then this will work, but if this user is being PAT'd as they go out you need to be running 6.3 code on the PIX for this to work (and enable the PPTP fixup).
"Regular translation creation failed" means an outbound packet was denied because the nat translation through the PIX didn't work. The PIX needs to NAT every outbound packet in some way, and if it can't you'll get this error. You need to look at either the static or the nat/global pair for this IP address pair and see what's going on.
Also, the PIX won't open a hole for GRE packets to come back in, so you need to have an ACL on the outside that allows GRE back in.
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...