305 ILCS 5/10-14.1
Notwithstanding the 30-day appeal period provided in Sections 10-12 and 10-12.1 and the limitation on review of final administrative decisions contained in Section 10-14, a responsible relative or a person receiving child support enforcement services under this Article who is aggrieved by an administrative order entered under Section 10-11 or 10-11.1 or an administrative determination of paternity entered under Section 10-17.7 and who did not petition within the 30-day appeal period may petition the Illinois Department for relief from the administrative order or determination on the same grounds as are provided for relief from judgments under Section 2-1401 of the Code of Civil Procedure. The petition must be filed not later than 2 years after the entry of the order or determination by the Illinois Department. The day immediately subsequent to the mailing of the order or determination shall be considered as the first day and the day the petition is received by the Illinois Department shall be considered as the last day in computing the 2-year period. Any period during which the person seeking relief is under a legal disability or duress or during which the grounds for relief are fraudulently concealed shall be excluded in computing the period of 2 years.
Upon receiving a petition within the 2-year period, the Illinois Department shall provide for a hearing to be held on the petition.
305 ILCS 5/10-14.1