I've configured my DB suffix at /etc/openldap/slapd.conf

...

suffix "o=Iddover, c=Net"

But slapd doesn't like the dn, if I've used "cn=Iddover, cn=Net" slapd start normally.

"Net" is invalid per "c" syntax. The ITS is intended for software bugs; please direct usage error questions to openldap-technical. This ITS will be closed.

p.