The update was from 2.4.17 to 2.4.18 build with openssl.
,----[ ldaprc ]
| BASE o=avci,c=de
| TLS_CACERT /home/dieter/certs/avciCA.pem
| TLS_CERT /home/dieter/certs/dkluenter.pem
| TLS_KEY /home/dieter/certs/dkluenter-key.pem
| TLS_CIPHER_SUITE HIGH
| TLS_REQCERT demand
`----
,----[ cn=config.ldif ]
| olcTLSCACertificateFile: /etc/openldap/certs/avciCA.pem
| olcTLSCertificateFile: /etc/openldap/certs/magenta.pem
| olcTLSCertificateKeyFile: /etc/openldap/certs/magenta-key.pem
| olcTLSCipherSuite: HIGH:MEDIUM
| olcTLSVerifyClient: demand
`----