Unable to connect via SSH

[martin1886]

Hi 

Was wondering if anyone has ever experienced or got any suggestions regarding an issue connecting to a SF300-24 switch running v1.4.11.2?

Issue is that we have been happily connecting via SSH using RADIUS auth for sometime but we are now getting "Signature from server's host key is invalid" as a Putty fatal error when we try to connect. No changes have been made to the switch.

Thanks

[Nolaan · Accepted solution]

Have you tried logging in with other software, such as MobaXterm, SecureCRT?

[russell0]

%SSH-4-SSH2_UNEXPECTED_MSG: Unexpected message type has arrived. Terminating the connection from %

I experienced the above issue on an ISR 4300 series.

It was accompanied by the following error in PuTTY:

signature from server's host key is invalid

Comparing show ip ssh output to another working router, we noticed below "CISCO_IDEVID_SUDI" where the other router had a hostname.

show ip ssh
...
IOS Keys in SECSH format(ssh-rsa, base64 encoded): CISCO_IDEVID_SUDI

Configuring an SSH RSA keypair name fixed it:

ip ssh rsa keypair-name %device-fqdn%