The computer must be joined to the Active Directory for this to work. To join it, follow the steps from this KB article.
"\\sccmcas.ad.uillinois.edu\client$\ccmsetup.exe" SMSSITECODE=MP1 SMSMP=sccmuiucdp1.ad.uillinois.edu SMSSLP=sccmuiucdp1.ad.uillinois.edu