The IP address has changed and now not SSH!

Having a strange problem with a sensor of version 4.1... It worked normally. Then I changed its IP address. This includes also change the subnet mask, gateway, access list, etc., but also regeneration of TLS and SSH keys.

Now the sensor can ping to the CiscoWorks Server (on a different subnet), and the CW server can ping back. But it is not report events and I can't use SSH to enter. Telnet on port 22 connects and waits a few seconds then disconnects in silence. I have not activated the unencrypted telnet service regular. Console access work, however and the look of the correct network settings.

Could someone please tell me what I might be missing, or direct me to the proper documentation?

Thank you!

It seems to be a problem of access list. A way to check with the service account would be to rename /etc/hosts.deny (to something else) and then try to connect. (Do not run sensor production without/etc/hosts. Deny! It's just a quick way to disable the execution of the access list to determine if this is the source of the problem.)

4.x IDS sensors use TCP wrappers to apply access lists, which means that you will always be able to ping to an address not allowed. The three way TCP handshake is also still possible. Only after that the TCP socket connects it checks the remote address against your access list entries. If the address is not allowed, the TCP socket closed silently.

Another point of data here would be to check if you have access to the web server. In an authorized host, run a web browser and go to the following ADDRESS:

https://10.1.2.3

where "10.1.2.3" is the IP address of the sensor.

If we can access the web server, but not the SSH server, which would indicate a different problem from that of access lists.

Tags: Cisco Security

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