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vCenter Server registration fails with the error: Extension already registered (2150615)

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On an NSX MP UI/API, you see these symptoms:
  • The vCenter Server registration fails.
  • You see this error:

    Extension already registered
  • You see the error similar to:

    Compute manager 6e22fdc6-7f1b-4e01-b2c6-c26fe8a0159c registration failed with server due to issue Error in rest call. url= //cm-inventory/api/v1/cm-plugin-container/cm-plugins?action=register , method= POST , response= { "httpStatus" : "BAD_REQUEST", "error_code" : 40110, "module_name" : "cm-inventory", "error_message" : "Extension already registered at with id 6e22fdc6-7f1b-4e01-b2c6-c26fe8a0159c" } , error= 400 Bad Request .


This issue occurs when a vCenter Server is already registered on one NSX Manager, and you attempt to register the same vCenter Server to another NSX Manager.


This issue is resolved in VMware NSX-T 2.0.0, available at VMware Downloads.

To work around this issue, remove the extension.
  1. Log in to this URL https://VC_FQDN/mob/?moid=ExtensionManager as a vCenter Server Administrator.
  2. Use the UnregisterExtension to remove the extension.

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