What is this interface connected to? Typically when you see a down down, then I would first look for Layer 1 connectivity first.... checking the physical connectivity.... like the vlan on the switch and the switchport is not shut down or in an errordisable state.
This is the first few steps I would take and then replace the cable.
Thanks and Cheers!
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I had this problem today. Ended up being that the man0/0 interface was administratively shut down in the system context. So not only does it have to be enabled in the context that you allocate the interface to, but it needs to be enabled in the system context as well.
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...