Unable to start Plesk migration: Failed to fetch basic information about resellers, clients and domains data from source servers

Symptoms 

• Unable to start migration with one of the following error messages:

  PLESK_ERROR: Unable to login to the source server 'source' (203.0.113.2) by SSH service: administrator login and/or password are not correct.
  Set valid SSH credentials for the server and click "Prepare migration".

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  PLESK_ERROR: SSH connection to the source server can not be used: there is unexpected output when executing commands.

• Migration fails with one of the following error messages:

  PLESK_ERROR: Cannot request remote agent status using command line

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  PLESK_ERROR: Failed to fetch basic information about resellers, clients and domains data from source servers. Cause: Command execution failed on the local server with non-zero exit code.

Cause

Plesk Migrator cannot log in to the source server using SSH key.

Resolution

1. Connect to the source server via SSH.

   Note: if direct SSH access to the server is not possible, contact server administrator for further assistance.

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

   # vi /etc/ssh/sshd_config

3. Set the PermitRootLogin and PasswordAuthentication settings to 'yes' and remove '#' at the beginning of each line as shown below:

   CONFIG_TEXT: PermitRootLogin yes
   PasswordAuthentication yes

4. Save the changes and close the file.

5. Restart the SSH service:

   # service sshd restart

   Note: If you doubt that the root password is correct, reset it with the command 'passwd'.

6. Restart migration.

Additional Information

To migrate with a non-root user, visit:

• Migrating From a Linux Server With Custom Hosting - Plesk Migration Guide

To learn more about Plesk migration, visit:

• Migrating via the Plesk Interface - Plesk Migration Guide