Conn. Gen. Stat. § 31-321: Manner of serving notices.

Unless otherwise specifically provided, or unless the circumstances of the case or the rules of the commission direct otherwise, any notice required under this chapter to be served upon an employer, employee, administrative law judge or the chairperson shall be by written or printed notice, service personally or by registered or certified mail addressed to the person upon whom it is to be served at the person's last-known residence or place of business. Notices on behalf of a minor shall be given by or to such minor's parent or guardian or, if there is no parent or guardian, then by or to such minor.