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SSH Connection Failure to Linux Machine Requiring Multiple Sequential AuthenticationMethods

KB ID: 4479
Product: Veeam Backup & Replication
Published: 2023-08-03
Last Modified: 2023-08-03
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Challenge

Connections to a Linux machine fail with the following errors:

Authentication was partially successful, but server
requires additional authentication with: 'password'.
No suitable authentication method is supported.
Supported methods: 'password'.
Addtional Methods
Suitable

Some tasks may not display these errors and instead behave as if the SSH connection failed. The error, however, is still written in the logs:

Warning      Failed to establish SSH connection.
Warning      No suitable authentication method found to complete authentication (password). (Renci.SshNet.Common.SshAuthenticationException)

Cause

This error occurs when the remote Linux machine's SSH service /etc/ssh/sshd_config has been configured to require two or more authentication methods in sequence.

For example, "AuthenticationMethods publickey,password" would require that all connections must provide first the publickey and then enter the account password.

Veeam Backup & Replication supports SSH authentication using username and password or publickey, but it does not support the use of both in sequence.

 

Solution

Update the AuthenticationMethods setting within /etc/ssh/sshd_config so that it does not require more than one authentication method.
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