@MattWho  Thanks for the answers ! You're right in my nifi.properties : nifi.security.needClientAuth is set to false. My version of nifi is an old one (1.9.2). I will pay more attention during my next upgrade.   My nifi and my nifi-registry are both secured. I have only added the CN of my nifi app cert into authorizers.xml file (userGroupProvider and accessPolicyProvider). ... View more