Hi @colin
maybe it depends on the whitespaces in →
plugins.security.authcz.admin_dn:
- CN=kirk,OU=client,O=client,L=test, C=de
or you have a similar problem like I had.( Securityadmin.sh can’t read subject from certificate - Security - OpenSearch)
→ you have to set in your opensearch.yml
plugins.security.ssl.http.clientauth_mode: NONE
Best regards