Based on the current configuration, the SSL certificate of the authentication server was not trusted.

By | November 14, 2014
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The following error:

vca_sslcan happen when you change the network identification for the vCenter Server Appliance (by default, certificate is generated for something like localhost.localhost) To resolve this issue, toggle the certificate settings.

To toggle the certificate settings:
  1. Log in to the vCenter Server Appliance Web interface at https://hostname:5480/.
  2. Click the Admin tab.
  3. Regenerate certificates:
    • vCenter Server 5.1: Select Toggle certificate setting so that the Certificate regeneration enabled displays Yes.
    • vCenter Server 5.5: Select Yes under Certificate regeneration enabled.
  4. Click Submit.
  5. Reboot the vCenter Server Appliance.
  6. After the vCenter Server Appliance reboots, confirm that the Certificate regeneration enabled option is set to disabled.