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vCenter Server Public Key Authentication configuration SSH error received disconnect Too many authentication failures

This article is a second part of vCenter Server SSH received disconnect Too many authentication failures. In ther earlier article I resolved error without touching or configuring the VCSA (vCenter Server Appliance Server) to skip public key authentication. In this article I will configure VCSA server (VMware vCenter Server) to use public key authentication so I don't have do any extra settings on my system.

To use Public key authentication to access vCenter server is a one-time activity, To start configuring laptop or desktop to login vCenter Server hassle free and without any extra parameter to remember.

Use puTTygen  (putty key generator) tool to generate public and private key pair. By default this tool is available on Windows 10. In the SearchBar find for PuTTYgen name. Click the Generate button and move the mouse over key area to generate random key based on the movement.

Putty key generator generate a public private key pair rsa dsa ecdsa vmware vsphere randomness mouse blank area key vcenter server vcsa photon os rsa ssh open ssh error public key authentication.png

Public key for OpenSSH autherized_keys file is generated, copy it, additionally you can add key passphrase to secure the key. Copy the key. (You can download and store private key in secure location, it should not be shared with others, You can use it to recover public key if it is lost using private key).

Microsoft Powershell vmware vsphere vcenter vcsa photon os putty key generator public key private key passphrase ppk rsa dsa ecdsa edDSA ssh-1 2048 OpenSSH.png

On the vCenter server login I have used earlier article vCenter Server SSH received disconnect Too many authentication failures to login. I am under /root home folder, since I will be using the same root user to login remotely to vCenter server. The copied public key string needs to be stored in authorized_keys under .ssh folder. 

microsoft powershell ssh putty pre-authentication banner message vmware vcenter server vcsa esxi password error SSH received disconnect Too many authentication failures bash shell .ssh authorized_keys pwd vi.png

You can use vi tool to open and edit .ssh/authorized_keys file, hit i button to edit, paste public key ssh-rsa string to the file. hit esc key, type :wq and click Enter button on keyboard. Verify keys are added to the file with cat command.

Putty vmware vsphere vcenter esxi ssh-rsa public key private key cat .ssh authorized_keys pwd root pubkeyauthentication public key authentication openssh vcsa vcenter server vmware vsphere error too many authentication.png

In the last verify OpenSSH connection on putty, ssh without pubkeyauthentication parameters or other tools, In my case all are successful.

Microsoft Powershell SSH putty mobaxterm root username api shell bash plugin pi list banner message vmware vsphere esxi vcsa photon os error resolved embedded platform services controller vcenter server.png

Additionally if you don't want to enter password you can use private key on the putty to login passwordless. Go to PuTTy configuration >> Connection >> SSH >> Auth. Browse Private key file for authentication and try login remote VCSA server, It will not ask for password.

Putty vmware vsphere vcenter esxi private key file authentication TIS authentication agent forwarding public key authentication OpenSSH key authentication powershell ss openSSH.png

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