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Product Version: 8.5
Last Modified: 22 Feb 2018


VMware VM processing fails. The following error message appears:

An error has occurred while backing up/replicating/recovering one or more disks of the VM.

Possible Causes

DNS Issues

  • There might be a problem with resolving ESXi host DNS name on the Transporter machine.
  • ESXi host might have multiple IPs, while some of them are not reachable by the Transporter.

Make sure that:

  • Source and target ESXi hosts can be pinged from the appropriate Transporter (using both DNS name and IP).
  • If ping fails, edit the HOSTS file on the Transporter machine and specify the proper DNS resolution rules.

Closed Ports

NAKIVO Backup & Replication requires the following TCP ports to be open for successful VM processing:

TCP Port  #
4443DirectorUsed to access the Director web UI. Must be open on the Director machine.
9446TransporterUsed by Director and Transporters to communicate with the Transporter. Must be open on the Transporter machine.
9448-10000TransporterUsed by Transporters for cross-Transporter data transfer. Must be open on the Transporter machine.
443vCenter Server
ESXi hosts

Used by Director and Transporters to access VMware infrastructure. Must be open on vCenter Servers and ESXi hosts.

902ESXi hosts

Used by Transporters to access VMware infrastructure. Must be open on ESXi hosts.

Make sure that: 

  • Required ports are not used by other applications.
  • Required ports are not blocked.
  • The ports are accessible from the appropriate endpoints.

Server Outage

  • Source or target ESXi host might be disconnected or powered off.
  • Source or target Transporter might be disconnected or powered off.

Make sure all ESXi hosts and all Transporters are available.

Outdated Free VMware ESXi host

  • Free VMware ESXi host certificate might be outdated

Make sure that the certificate is up-to-date. To generate the latest certificate for Free ESXi, read the corresponding section of the VMware Security guide.

VPXA service issue

  • VPXA service on the target ESXi host could be stuck or work incorrectly.

Try to restart the service. Refer to the VMware Knowledge Base article for details.

VM disk issues

  • The target VM disk might not exist
  • The target VM could not be changed
  • VMware might have failed to write some data blocks to the target VM.

Perform the following actions:

  •  If possible, use a different datastore for recovery
  • Check VMware events/logs of the storage device to see if there is any indication of problems.
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