I'm not sure what happened, but all of a sudden wbinfo and wbinfo_group.pl are not returning group data. ./testwb ++ wbinfo -n USER + sid='S-1-5-21-1607859618-1323328405-3834754132-2081 User (1)' + wbinfo -Y 'S-1-5-21-1607859618-1323328405-3834754132-2081 User (1)' Could not convert sid S-1-5-21-1607859618-1323328405-3834754132-2081 User (1) to gid + wbinfo -Y S-1-5-21-1607859618-1323328405-3834754132-2081 Could not convert sid S-1-5-21-1607859618-1323328405-3834754132-2081 to gid ++ wbinfo -n GROUP + sid='S-1-5-21-1607859618-1323328405-3834754132-2829 Domain Group (2)' + wbinfo -Y 'S-1-5-21-1607859618-1323328405-3834754132-2829 Domain Group (2)' Could not convert sid S-1-5-21-1607859618-1323328405-3834754132-2829 Domain Group (2) to gid + wbinfo -Y S-1-5-21-1607859618-1323328405-3834754132-2829 10000 + wbinfo -r USER Could not get groups for user USER wbinfo_group.pl -d Debugging mode ON. USER GROUP Got USER GROUP from squid User: -USER- Group: -GROUP- SID: -S-1-5-21-1607859618-1323328405-3834754132-2829- GID: -10000- Could not get groups for user USER Sending ERR to squid ERR I've seen the problem a lot, but no fix. Thanks in advance.