Baselines are based on metadata that Update Manager downloads from the VMware and third-party websites.


Updates for ESXi hosts might be unavailable.


  • Misconfigured Web server proxy.
  • Third-party servers are unavailable.
  • VMware update service is unavailable.
  • Poor network connectivity.


  • Check the connectivity settings. For more information, see Change the Update Manager Network Settings in the vSphere Web Client.
  • Check the third-party websites to determine whether they are available.
  • Check the VMware website ( to determine whether it is available.
  • Check whether other applications that use networking are functioning as expected. Consult your network administrator whether the network is working as expected.