WARNING: No server certificate verification method has been enabled

NethServer Version: NethServer release 6.9 (Final)
I configured my NS like this post OpenVPN with Nethserver howto?

Connect to NS good, but I got the error in the log openvpn clients: WARNING: No server certificate verification method has been enabled.

What is it?

[details=Solved. Just remaked account.]If to turn mode auth login,pass,certificat, then not connect, and got error:
> Sun Jul 2 18:34:54 2017 myip:port TLS_ERROR: BIO read tls_read_plaintext error: error:140890C7:SSL routines:SSL3_GET_CLIENT_CERTIFICATE:peer did not return a certificate
> Sun Jul 2 18:34:54 2017 myip:port TLS Error: TLS object -> incoming plaintext read error
> Sun Jul 2 18:34:54 2017 myip:port TLS Error: TLS handshake failed[/details]

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