lsof | grep /dev/sda – if a process holds the disk open (e.g., old NFS lock, fsck), reboot or stop the service.


Converter Helper will attempt to run commands with sudo. Run:

sudo -k  # Reset timestamp
sudo -n fdisk -l 2>/dev/null

If you receive a "sudo: a password is required" message, you must configure passwordless sudo for the converter user:

sudo visudo -f /etc/sudoers.d/vmware-converter
# Add line: converter_user ALL=(ALL) NOPASSWD: ALL
  • On the Linux source, tail the SSHD logs while attempting connection:
  • If SSH fails, resolve basic connectivity (DNS, routing, firewall, host key mismatch).
  • Ensure the login shell for the user is a standard shell (bash, sh). Non-interactive shells or restricted shells can block command execution.
  • If device-mapper / LVM commands fail, address that (install lvm2).
  • For AppArmor, try disabling the relevant profiles or put them in complain mode.
  • If this fixes the problem, create appropriate policy rules rather than leaving them disabled.
  • Ensure disk devices are present and not hidden by unusual multipath or encrypted setups unless Converter supports them.
  • Restart sshd after changes: sudo systemctl restart sshd

  • The most common cause is network filtering. Converter uses specific ports to communicate with the Linux agent.

    If the conversion works after disabling the firewall, you need to create a rule allowing traffic from the Converter Standalone server IP to the source machine on the ports listed above.

    If you absolutely cannot get the live query to work, use one of these reliable alternatives.