A working netatalk afp.conf file (it needs the uam list property set)

afp.conf

;
; Netatalk 3.x configuration file
;

[Global]
; Global server settings
log file = /var/log/afpd.log
;log level = default:debug afpdaemon:debug
uam list = uams_dhx.so uams_dhx2.so

[Homes]
basedir regex = /home

[Backup]
path = /backup
time machine = yes
acls = no

[Archive]
path = /archive
; valid users sysadmin