[User Aliases] This section will replace a user name specified in the connect string of a DNS with an internal alias. This alias is used in the third colon delimited field of a mapping rule.The example below shows how certain users or an empty user are handled. In this case they are rejected.[User Aliases] scott|system = insecure ^$ = blank [Mapping Rules] *:*:blank:*:*:*:rw = reject You should specify a username *:*:insecure:*:*:*:rw = reject The user is not allowed