ESX Error - The specified key, name or identifier already exists

To resolve the issue of the error :

     The specified key, name or identifier already exists

From the command line of the ESX box run the following command :

[root@ESX root]# service mgmt-vmware restart

If this fails to resolve the issue run the following commands :

service mgmt-vmware restart
service vmware-vpxa restart
service vmware-vmkauthd restart