topic Hi,This should help you in in Network Security

Telnet and SSH issue on Cisco 3750.

Jean-Marie NGOK GWEM — Fri, 21 Feb 2020 13:32:29 GMT

I enable on Cisco 3750 and all of sudden I was not able to login into the box. I even changed the source interface and update the transport input method under the VTY lines, no luck.

Then I choose to disable SSH by removing the pertaining configs lines and the RSA keys. And I changed the transport input back to Telnet. After rebooting the switch I am still not able to log in despite the fact that the box is reachable.

Any help ?

Thanks,

Jean-Marie

Hi,This should help you in

Dinesh Moudgil — Fri, 24 Jul 2015 01:02:49 GMT

Hi,

This should help you in confirming the configuration and troubleshooting SSH on your device:-

http://www.cisco.com/c/en/us/support/docs/security-vpn/secure-shell-ssh/4145-ssh.html

Hope this helps.
Regards,
Dinesh Moudgil

P.S. Please rate helpful posts.

Dinesh,Thanks. I had this doc

Jean-Marie NGOK GWEM — Fri, 24 Jul 2015 16:01:24 GMT

Dinesh,

Thanks. I had this doc before posting this issue. I have removed the SSHv1/v2, the RSA keys and reloaded the devices, still no luck.

I also changed the transport input to telnet and i can't have the prompt. The devices are reachable however there is no prompt when I initiate the SSH or the Telnet. I even received the message stating that device refuses the connection.

Any help ?

Can you share the config? At

Marvin Rhoads — Sat, 25 Jul 2015 03:23:03 GMT

Can you share the config? At least any aaa and the line vty sections.

You don't have Control Plane Policing (COPP) enabled do you?

Have you tried "debug ip ssh" on console while trying to log in via ssh to the vty line?

You can believe the solution.

Jean-Marie NGOK GWEM — Wed, 29 Jul 2015 02:43:22 GMT

You can believe the solution. The config line was the command "exec" to enable the prompt once you telnet or ssh to the router.

Thanks all for your

Jean-Marie NGOK GWEM — Wed, 29 Jul 2015 02:43:56 GMT

Thanks all for your contribution