OpenLDAP - loglevel none
For a long time, I have wanted to know which loglevel to set in OpenLDAP's slapd.conf to get just errors in the log. For many years, I have obviously been too quick in reading the manual page slapd.conf(5).
The answer is loglevel none, which I find less than obvious..
Today, I also learned that if the LDAP Users and Groups module in Webmin says No structuralObjectClass operational attribute, that may mean that you're trying to add an object with two structural object classes set.