Verifying that localhost can SSH to localhost.localdomain. [localhost.localdomain] Could not open an SSH connection: Could not establish connection: Authentication failed for user root@localhost.localdomain.

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i try to install puppet on a vm-ware server with linux (Centos). After submitting the form localhost:3000 i get the message: Verifying that localhost can SSH to localhost.localdomain. [localhost.localdomain] Could not open an SSH connection: Could not establish connection: Authentication failed for user root@localhost.localdomain .

What's the problem and how can i resolve this.