OpenVPN log warning

[unixpgmr]

I am getting the following warning in my OpenVPN log file:

Code Select Expand

openvpn[48501]: WARNING: POTENTIALLY DANGEROUS OPTION --verify-client-cert none|optional
(or --client-cert-not-required) may accept clients which do not present a certificate
I can't find a place in the server setting to require the client certificate.  How do I fix this? 

Thank you in advance for your help

[bartjsmit]

Change your server mode to include '(SSL/TLS)' in VPN: OpenVPN: Servers.

You will need to set up a PKI and update your client OVPN profile(s).

Bart...