[Fedora-directory-users] Error 12 on sorted queries

I'm still a little new at this, so hopefully this isn't a FAQ question, but I am having issues with sorted queries. Single-user queries, and queries without sorts seem to go fine, but I get error 12 (unavailable critical extension) trying to do sorted queries, and returns zero results when it should return five. Log is below. Any idea? This is probably something I have to set up somewhere, but I can't find anything in Google... [10/Oct/2007:14:16:12 -0400] conn=49 fd=86 slot=86 connection from a.b.c.d to e.f.g.h [10/Oct/2007:14:16:12 -0400] conn=49 op=0 BIND dn="" method=128 version=3 [10/Oct/2007:14:16:12 -0400] conn=49 op=0 RESULT err=0 tag=97 nentries=0 etime=0 dn="" [10/Oct/2007:14:16:12 -0400] conn=49 op=1 SRCH base="o=Mercer University" scope=2 filter="(&(departmentNumber=Art)(school=College of Liberal Arts))" attrs="a bunch of attributes here...." [10/Oct/2007:14:16:12 -0400] conn=49 op=1 SORT sn givenName (*) [10/Oct/2007:14:16:12 -0400] conn=49 op=1 RESULT err=12 tag=101 nentries=0 etime=0 notes=U Thanks, Scott