The SharePoint Central Administration Web Application authentication provider is a global setting to the server farm. When ...

The SharePoint Central Administration Web Application authentication provider is a global setting to the server farm.  When changing the authentication provider, a SharePoint Timer service job will be dispatched to synchronize the provider on all SharePoint Central Administration Web Applications in the server farm.  If {0} is specified, NTLM will be the exclusive authentication provider for all SharePoint Central Administration Web Applications.  All other authentication providers will be disabled and NTLM will be the only authentication provider allowed.  If {1} is specified, Kerberos authentication will be enabled for all SharePoint Central Administration Web Applications.  If an authentication provider is not specified, the provider used for existing SharePoint Central Administration Web Applications in the server farm will be used.  If a SharePoint Central Administration Web Application has not been provisioned in the server farm, then the Kerberos authentication provider will be enabled if an authentication provider is not specified.