I have an ASA 5505 that is causing me some issues. I set up ssh on the ASA and had it working. I then shipped it to the customer and the ssh no longer works. I have SSH wide open right now. I have also zeriozed the key and regenerated the key and nothing seems to work. Any suggestions? Also, I just decided to try to telnet and that does not work either. Thanks for your help in advance.
The next thing I would look at is are you accessing the ASA from inside or outside and have you added the corresponding SSH permit statements?
So if you are trying to connect to the outside interface and you are comming from X.X.X.X you would need the statement:
ssh X.X.X.X 255.255.255.255 outside
Make the subnet mask equivalent to whatever IP range you will be coming from... If you will always come from a single address use the 255.255.255.255 if you know you will come from a /29 network use the 255.255.255.248 and so on.
This sounds like an upstream issue if you do not see any evidence that it reaches the ASA. Some ISPs and/or network administrators will block network management protocols such as Telnet and SSH due to the damage that they can cause by malicious users. It is difficult and impractical to block the HTTPS used for ASDM.
You can configure packet captures on the outside interface of the ASA in question specifically for the host IP trying to SSH. For instance, consider the following capture syntax:
cap capout int outside packet-l 1522 buffer 512000 access-list TAC
After attempting to connect once or twice to the outside IP address, you should see packets in this packet capture - 'show capture capout'. If no packets are seen, the traffic is likely being blocked upstream.
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...