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

Make sure Verify that:

  • Source The source and target 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.


NAKIVO Backup & Replication requires certain TCP ports to be open for successful VM processing. Refer to the Deployment Requirements article for details. 

Make sure Verify that: 

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

Server Outage

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


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 working 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
  • Host 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 host events/logs of the storage device to see if there is any indication of problems.