This reset is coming from the inside host. PIX is not sending this RESET. We need to look at the server on the inside for specific settings if something is misconfigured. Following link explains all the flags for the syslog message you are getting-
The default gw must be PIXs inside interace. If the DG was not PIX inside interface, the syslog would showup teardown with flag "SYN Timeout", the very fact that connection is being torn doen due to "Reset-I" indicates that server is sending the responses back to PIX. Its not an issue with DG on the server.
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...