We have an odd issue which began by being unable to remotely connect to the ASA via ASDM or SSH. SSH prompts for username and password, but returns 'access denied' even when using the correct password. Logging into the console to troubleshoot, we find that the routing table is empty despite have multiple static routes in the config. Re-adding a route helps not at all. Attempt to ping something on the inside returns 'no route to host'. Even the connected interfaces are not showing in the routing table.
Oddly, the firewall is functioning and passing traffic. It has been rebooted at least once since this problem began. No changes between the time this was working and when it started.
Are you saying that the "show route" doesnt show any output?
Its kind of strange that a reboot would have not helped with this situation at all. Even more strange is the fact that you are saying that its passing traffic normally. Starts sounding like something you need help from Cisco TAC possibly.
Actually, now that I read your post, are you sure you are running 8.4(6). To my understanding your ASA model (the new X-series except for the ASA5585-X models) dont support that software.
Here is the list and it indeed does list that its not supported on your hardware
So if for some odd reason you are actually running this software then I would probably suggest upgrading the software and considering the nature of the problem set a side a long enough maintanance window incase something doesnt go quite as expected.
Though I would assume you just mistaken the software level?
Other than that I would probably check the current configuration and an older backup on separate text documents and compare possible differences. For example using Microsoft Word or something else that can easily compare the 2 different texts for differences.
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...