I'm still having issues with tls, getting a openldap 2.4
server to talk tls to each other.
routines:SSL3_GET_CLIENT_CERTIFICATE:peer did notreturn a certificate
You've configured your server slapd that it requests the client to
authenticate with a client certificate during TLS negotiation. But the
client does not have a client certificate.
See man 5 slapd.conf for learning about what option TLSVerifyClient means.