Rule 15.05.03 - DUE DILIGENCE AFFIDAVIT; LEAVE TO SERVE BY PUBLICATION(a) A party seeking the entry of a default judgment must file an affidavit of due diligence of service attempts.(b) If the petitioner is seeking a default by way of publication, the petitioner must first seek leave of court in order to do so.Ill. R. Cir. Ct. Dupage Cnty. 15.05.03