<div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small">I would like to test NTPsec on an internal network without Internet access. I have created self-signed certificates on both server and client.   But NTPsec on the server complains <br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small">NTS: error:14094418:SSL routines:ssl3_read_bytes:tlsv1 alert <b>unknown ca</b></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small">and on the client:</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small">2020-05-06T22:38:42 ntpd[9901]: NTSc: Using dir /var/lib/ntp/certs/ for root certificates.<br>2020-05-06T22:38:42 ntpd[9901]: NTSc: SSL_connect failed<br>2020-05-06T22:38:42 ntpd[9901]: NTS: error:14090086:SSL routines:ssl3_get_server_certificate:<b>certificate verify failed</b></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small">Is it not possible to use self-signed certificates?  Or am I missing some steps; is there a recipe that works for machines on private networks?</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small">Thank you!</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small">Richard Schmidt, CTR<br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small">US Naval Observatory <br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small">Washington, DC<br></div><br>-- <br><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><span style="color:rgb(0,0,0)">“The ideal subject of totalitarian rule is not the
 convinced Nazi or the convinced communist, but people for whom the 
distinction between fact and fiction . . . and the distinction between 
true and false . . . no longer exist.” —Hanna Arendt, “The Origins of 
Totalitarianism” (1951)</span><span><span></span></span></div></div></div></div></div></div></div>