version 10.6.1 had some security changes that included not allowing the admon user to login in Production environments. This is because this account is very well
known by end users and it has high privileges.
Keep in mind that this account is no longer available to log in to
Production environments, and it cannot be disabled, because it is used
internally for several tasks. We recommend giving administrator
permissions to another user in Production environments.
If you don't have a user with administrator permissions, follow the
guidelines described in this article to temporary login as admon user
to give administrator permissions and privileges to another user.