Unable to start a Plesk migration: /root/.ssh/authorized_keys: Permission denied

Symptoms

• Unable to start a Plesk migration. The following error message can be found in the downloaded debug logfile:

  CONFIG_TEXT: [ERROR] Failed to fetch basic information about resellers, clients and domains data from source servers
  Cause: The command "authorized_keys_dir="`dirname ~/.ssh/authorized_keys`";
  if [ ! -d "$authorized_keys_dir" ]; then
  mkdir -p "$authorized_keys_dir";
  fi;
  ...........
  executed at the source server 'source' (203.0.113.2) returned a non-zero exit code.
  Stderr:
  bash: line 8: /root/.ssh/authorized_keys: Permission denied

• The /root/.ssh file has immutable bit:

  # lsattr -a /root/.ssh
  ----i-------- /root/.ssh/.

Cause

Plesk is not able to create an authorized_keys file, because the /root/.ssh file is immutable.

Resolution

1. Connect to the source Plesk server via SSH.

2. Remove the immutable bit attribute:

   # chattr -i /root/.ssh

3. Restart the Plesk migration.