Ohio Rev. Code Ann. § 3901.17
(A) As used in this section:
(B) Any of the following acts in this state, effected by mail or otherwise, by any foreign or alien insurer not authorized to transact business within this state, any nonresident person acting on behalf of an insurer, or any nonresident insurance agent subjects the insurer, person, or agent to the exercise of personal jurisdiction over the insurer, person, or agent to the extent permitted by the constitutions of this state and of the United States:
(D) Service of any notice, order, subpoena, or process in any such action, suit, or proceeding shall, in addition to the manner provided in division (C) of this section, be valid if served upon any person within this state who, in this state on behalf of such insurer, person, or agent is or has been:
(I) This section does not apply to: