vCenter migration - Error: 'Failed to unregister vCenter Server. Real networks from this vCenter Server are still referenced' while unregistering old vCenter from VMware Cloud Director.

Products

• VMware Cloud Director

Issue/Introduction

• Unregistering a vCenter from the VCD UI prompts the following error:

  error: [ ########-####-####-####-############] Failed to unregister vCenter Server "####". Real networks from this vCenter Server are still referenced.

• There are no Provider Virtual Data Centers associated with that vCenter.
• This solution covers the scenario of migrating from an old vCenter Server to a new one, which already has all networks connected as they were on the old one.
  • For the scenario where you simply want to unregister this vCenter and remove all its resources from VCD, please see KB# 404252 

Environment

• VMware Cloud Director 10.5 / 10.6

Cause

This issue might be caused by existing External Networks that still reference the associated vCenter in VCD.

Resolution

Check and remove any remaining External Networks referencing the concerned vCenter.

If this is not sufficient or you are facing further errors, please contact VMware Support referencing this article.