Related to AllowedAuthentications, this is used to
specify what authentication methods the users must
complete before continuing. If this value is left
zero, it does not mean that no authentications are
required. It means that the client can authenticate
itself with any of the authentications given in
AllowedAuthentications. This parameter has no default.
Note: This parameter has to be a subset for
AllowedAuthentications. Otherwise, the server denies
connection every time.