annoying error in logs "Resource not found for the segment 'VirtualMachineExts'."

I get the error below about six times every minute. I have a HA install of vRA (2 vRA appliances).   After some investigation, the second vRA node is sending a request to the IaaS machines.

Any ideas why a request from the machine NOT hosting Postgres db would be sending to the IaaS Mgr VIP?

PS - When I stop "vcac-server", the error stops.  The machine is gone referenced in the IIS logs on the IaaS machine. Things seem to work fine, just an annoying error.

System.Data.Services.DataServiceException: Resource not found for the segment 'VirtualMachineExts'.

  at System.Data.Services.Providers.DataServiceExecutionProviderWrapper.GetSingleResultFromRequest(SegmentInfo segmentInfo)

  at System.Data.Services.DataService`1.CompareETagAndWriteResponse(RequestDescription description, IDataService dataService, IODataResponseMessage responseMessage)

  at System.Data.Services.DataService`1.HandleRequest()