Putty fatal error after upgrading Nutanix NOS

After a upgrading 32 Nutanix servers (8 boxes of 4 servers) I got a error from Putty while trying to connect to a CVM with SSH: “Disconnected: No supported authentication methods available (server sent: publickey)”

putty-error

 

 

 

 

Before upgrading I haven’t any problems using Putty to SSH to a CVM.

The error indicates that the server only accepts public key authentication.

After a (better) read of the post actions of the upgrade manual I checked the “Cluster Lockdown ” option in Prism. This option was enabled, thus login using SSH with username and password was disabled.

nutanix-lockdown

 

 

 

 

 

 

 

 

After placing a mark before “Enable Remote Login with Password” I was able to login again using SSH with a username and password.

Of course using SSH with a username and password isn’t that secure as with public key authentication but sometime it’s needed. If you would like to user Public key authentication with Putty, check this link.