NSX compute manager status "Not Registered" and down.

Products

• VMware NSX

Issue/Introduction

• This issue was noticed on the NSX federation setup, where the compute manager is well connected on GM, but not on LM.
• This issue was reported on LM during an upgrade to VCF 4.5.2, where the upgrade failed, and the vCenter snapshot was subsequently reverted on the VCF environment.
• On NSX UI, the error messages would keep toggling when you try to resolve the issue from NSX UI.

  Error message 1: Registration Status Message: "Compute Manager <vCenter FQDN> registration failed because of Deletion of extension at CM <vCenter FQDN>."
  Error message 2: Resolving "Error message 1" results in the following error message" Compute Manager <vCenter FQDN> registration failed because of Compute Manager  <vCenter FQDN> is already registered with other NSX Manager  <nsx manger IP:443>.

Environment

VMWare NSX-T Data Center.

Cause

This is caused by a stale entry object of the vCenter extension."com.vmware.nsx.management.nsxt" . since the same object is already registered to the same LM, NSX started reporting error. 

Resolution

1. Follow the steps below to resolve the issue.

   1. Log in to this URL "https://<vCenter FQDN>/mob/?moid=ExtensionManager" as a vCenter Server Administrator.
   2. Use the "UnregisterExtension" to remove the "com.vmware.nsx.management.nsxt" extension.
   3. Make sure the extension "com.vmware.nsx.management.nsxt" is removed correctly from vCenter extension. Verify it through step number 1.
   4. Edit the compute manager by providing [email protected] credentials.
   5. Click on resolve the issue if the error persists.
2. If the issue persists, please refer to the article - Installation of a Plugin fails in the vCenter or Open a Broadcom Support Case.

Additional Information

If the error or symptoms differ from those described, please contact Broadcom Support by submitting a support request referencing Knowledge Base article 206567.
Reference document to "Remove NSX-T Data Center Extension from vCenter Server" : https://techdocs.broadcom.com/us/en/vmware-cis/nsx/nsxt-dc/3-2/administration-guide/operations-and-management/remove-nsx-t-extension-from-vcenter-server.html