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Home > Success Center > Virtualization Manager (VMAN) > VMware vCenter servers display as Unknown in VMAN

VMware vCenter servers display as Unknown in VMAN

Updated December 4, 2017


When you poll for all VMware vCenter® servers on an Additional Polling Engine (APE), the procedure fails with following message in the VIM Business Layer:

2017-11-28 12:19:46,769 [45] ERROR SolarWinds.VIM.BusinessLayer.Polling.VMwareProbeResultsProcessorBase - Error sending probe job results to main BL.
SolarWinds.ApiProxyFactory.TransientApiProxyException: Exception of type 'SolarWinds.ApiProxyFactory.TransientApiProxyException' was thrown. ---> System.ServiceModel.EndpointNotFoundException: No DNS entries exist for host main.orion.server. ---> System.Net.Sockets.SocketException: No such host is known
at System.Net.Dns.GetAddrInfo(String name)


  • Virtual Manager (VMAN) 8.0
  • Orion Platform
  • Additional Polling Engine


Incorrect DNS configuration on the Additional Polling Engine.


Configure the correct DNS entries in Microsoft® Active Directory® or the hosts files. 




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