Hello Matt, Thank you ! this solved the error (now I'm facing another one, but will figure it out 🙂 ). For further reference I had to configure those 3 lines in nifi.properties : nifi.security.identity.mapping.pattern.dn=^CN=(.*?), OU=(.*?) nifi.security.identity.mapping.transform.dn=NONE nifi.security.identity.mapping.value.dn=$1@$2   Thanks. Vince. ... View more