HP-UX Directory Server 8.1 console guide

9. Set the preferences for client authentication.
Do not allow client authentication.
With this option, the server ignores the client's certificate. This does not mean that the
bind will fail.
Allow client authentication
This is the default setting. With this option, authentication is performed on the client's
request.
Require client authentication.
With this option, the server requests authentication from the client. With this option,
all clients must use a certificate to authenticate to the server, and no simple authentication
(username/password) is allowed.
6.3 Enabling TLS/SSL 73