HCX reverse migration fails during validation with "Failed do to do migration quick validation null"

Products

• VMware HCX

Issue/Introduction

• While performing a HCX reverse migration, the migration reports error during "Validation" stage
  
  "Failed do to do migration quick validation null"
  
  
  
  
• The /common/logas/admin/web.log at the target ie "Onprem", shows following entries
  
  2025-11-14 02:08:36.376 UTC [https-jsse-nio-127.0.0.1-8443-exec-9, Ent: HybridityAdmin, , TxId: TxId: daa7d6d0-7bf8-46de-84a0-de7ce7994bad] ERROR c.v.v.h.a.m.MobilityGroupRestController- Error while validating Mobility Group request.java.lang.RuntimeException: Failed do to do migration quick validation null
.........
.........
Caused by: java.lang.NullPointerException: null
at com.vmware.vchs.hybridity.mobility.validation.TargetSideQuickValidationUtil.updateWarningForUnextendedNetwork(TargetSideQuickValidationUtil.java:4482)
at com.vmware.vchs.hybridity.mobility.validation.TargetSideQuickValidationUtil.destinationSideValidationNonOsam(TargetSideQuickValidationUtil.java:317)
  
  
• The validation error is seen is with all the migration types ie Cold, Bulk or RAV.
  
  
• The network used by VM at the destination was either recently extended or un-extended and had issue during these workflows.

Environment

VMware HCX

Cause

The null error is caused by the validation process attempting to read the destination network ID from the stretched network list, where it encountered stale network extension entries missing source and destination network details.

Resolution

The resolution requires changes in the HCX DB to remove the stale configuration record for the network from recently extended or un-extended activity.

Please gather the following details and open a support request with Broadcom - Creating and managing Broadcom support request (SR) cases

• Generate a HAR file while replicating the validation error in a browser. More information on generating HAR file, please refer - Generate HAR file
• Gather the HCX logs (Onprem & Cloud) including the database. More information on gathering the HCX logs, please refer - Gather HCX Technical Support Logs