Section 215 ILCS 5/198 - Service of summons and return(1) Upon the filing of a complaint, summons shall forthwith issue, returnable in 3 days after its date, and a copy of the summons together with the complaint in any proceeding under this article shall be served upon the company named in such complaint by delivering the same to its president, vice president, secretary, treasurer, director, or to its managing agent, or if the company lack any of the aforesaid officers, or they cannot be found within the State, to the officer performing corresponding functions under another name; if it be a Lloyds, reciprocal or inter-insurance exchange, by delivering such summons and copy of the complaint to the duly designated attorney-in-fact.(2) When it is satisfactorily proved by the report of an examiner of the department made in accordance with the provisions of this Code, or by affidavit if anyone familiar with the facts, that the officers, directors, trustees or managing agents or members of any company named in said complaint upon whom service is required to be made as above provided, have, or if a Lloyds, reciprocal or inter-insurance exchange be named in the complaint, that the duly designated attorney-in-fact, has, departed from the State or keep themselves or himself concealed therein, or if such of the persons residing in this State and upon whom service is required to be made as above provided have resigned from their offices, or that service cannot be made immediately by the exercise of reasonable diligence, such service may be had by the mailing of a copy of the complaint and summons to the last known address of the company, or by publication in such form and in such manner as the court shall order.