We have seen the same behavior in the new PIX OS 6.2.1 with PDM 1.1.2 - the OS wants PDM 2.01 but Cisco hasn't made it public yet. The message went away when we added AAA authenication via Cisco Secure ACS. Then the message changed to "Cisco does not support PDM on this version of the OS". There appear to be problems with PDM 1.1.2 on 6.2.1 - don't try it. Write mem adds some strange lines to the config. But for the earlier OS, PDM corruption is certainly a possibility. If you reloaded the OS, with PDM 1.1.2 already in flash, definitely load it again and reboot.
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...