Hi,To modify the cn=config DIT you'll have to modify the files under /etc/ldap/slapd.d/cn=config where your config is stored.
In your case :
- delete  /etc/ldap/slapd.d/cn=config/olcDatabase=\{2\}null/
- modify  /etc/ldap/slapd.d/cn=config/cn=module{0}.ldif  by removing the 
line olcModuleLoad: {1}back_null
You should then be able to restart the slapd daemon. Reguards, Quentin Pétel Le 13/08/2013 14:34, Robert Wolf a écrit :
module.
But it is impossible to delete olcDatabase={2}null from cn=config (error 53
unwilling to perform) and it is impossible delete the back_null module (error
80 cannot delete olcModuleLoad).