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System users are not able to connect to a Plesk server over SSH/SFTP: No supported authentication methods available

Kuzma Ivanov
Updated
Plesk for Linux kb: technical ABT: Group A

Applicable to:

  • Plesk for Linux

Symptoms

  • Access to a Plesk server over SSH/SFTP under a subscription's system user fails with one of the following error messages:

    CONFIG_TEXT: Permission denied (publickey).

    CONFIG_TEXT: Disconnected: No supported authentication methods available (server sent: publickey,gssapi-keyex,gssapi-with-mic)

    CONFIG_TEXT: can't connect to remote host: authentication failed

  • SSH access is set to some shell (not Forbidden) at Domains > example.com > Hosting & DNS tab > Hosting > Web Hosting Access.

Cause

Password authentication for SSH connections is not enabled on the server:

# grep PasswordAuthentication /etc/ssh/sshd_config
PasswordAuthentication no

Resolution

Note: This solution is intended for Plesk administrators only. If you are a domain owner, please contact your service provider for assistance.

  1. Connect to your Plesk server via SSH.

  2. Create a backup of the file /etc/ssh/sshd_config:

    # cp /etc/ssh/sshd_config /etc/ssh/sshd_config.bak

  3. Open /etc/ssh/sshd_config in a text editor. In this example, we are using vi editor:

    # vi /etc/ssh/sshd_config

  4. Enable password authentication for SSH connections:

    CONFIG_TEXT: PasswordAuthentication yes

  5. Save the changes sand close the file.

  6. Restart the SSH service:

    # service sshd restart

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Comments

1 comment
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    WebCodePoet

    How exactly should I login to the server over ssh, if the server does not login over ssh?

    The full tutorial is bullshit. 

    -1

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