How can I disable ACLs in case of misconfiguration?
You can use ignoreAcl dn
The ignoreAcl value tells FusionDirectory to ignore complete ACL sets for the given DN. Add your DN and you'll be able to restore accidently dropped ACLs.
You need to add ignoreAcl dn in the main section of your fusiondirectory.conf like in this exemple :
<main default="default" ... ignoreAcl="put_the_desired_dn" ...