I'm getting this:

wheel { ~/src } # sup -v /etc/sup.conf
SUP 8.26 (4.3 BSD) for file /etc/sup.conf at Feb 21 10:03:38
SUP Upgrade of current-allsrc at Wed Feb 21 10:03:39 1996
SUP Fileserver 8.13 (4.3 BSD) 21813 on netbsd.warped.com at 10:03:39
SUP: Reason:  Unknown user anon
SUP: Improper login to default accountSUP: Upgrade of current-allsrc aborted at Feb 21 10:03:41 1996
SUP: Aborted
SUP Upgrade of current-security at Wed Feb 21 10:03:42 1996
SUP Fileserver 8.13 (4.3 BSD) 21814 on netbsd.warped.com at 10:03:42
SUP: Reason:  Unknown user anon
SUP: Improper login to default accountSUP: Upgrade of current-security aborted at Feb 21 10:03:43 1996
SUP: Aborted

   etc. with this /etc/sup.conf:

current release=allsrc host=sup.netbsd.org hostbase=/ftp/pub base=/usr prefix=/usr backup use-rel-suffix delete

current release=security host=sup.netbsd.org hostbase=/ftp/pub base=/usr prefix=/usr backup use-rel-suffix delete

current release=doc host=sup.netbsd.org hostbase=/ftp/pub base=/usr prefix=/usr backup use-rel-suffix delete

current release=othersrc host=sup.netbsd.org hostbase=/ftp/pub base=/usr prefix=/usr backup use-rel-suffix delete

                                      Gary D. Duzan
                         Humble Practitioner of the Computer Arts