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)”






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.










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.

About Michael
Michael Wilmsen is a experienced VMware Architect with more than 20 years in the IT industry. Main focus is VMware vSphere, Horizon View and Hyper Converged with a deep interest into performance and architecture. Michael is VCDX 210 certified, has been rewarded with the vExpert title from 2011, Nutanix Tech Champion and a Nutanix Platform Professional.

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