File Recovery: Connection to Recovery Server Refused

Product version: 9.0

Last modified: 27 September 2019


While recovering an SLES VM, an error message appears informing the user that the connection to the recovery server was refused.


The cause of the problem is an inappropriate form of SSH protocol authentication configured for the VM host operating system.

If the public key authentication or keyboard-interactive authentication is enabled for the VM host operating system, and when NAKIVO Backup & Replication tries to access the VM via the SSH protocol, the source VM uses keyboard-interactive authentication and asks for the password.


Follow the steps below to enable the password authentication method for the SSH protocol on the VM:

  1. Log in to the VM and launch the vi editor.

  2. In the vi editor, open the /etc/ssh/sshd_config file and make the following modifications:

    1. PasswordAuthentication yes

    2. ChallengeResponseAuthentication yes

  3. Save the /etc/ssh/sshd_config file and exit the vi editor.

  4. Reboot the VM.