Hi Yuri, Thank you for your help. Yes, 853 is open. I can see in the log files that Unbound is making SSL connections, though they are not authenticated.
I believe the problem is the tls-cert-bundle keyword or syntax: tls-cert-bundle: "/etc/ssl/certs/ca-certificates.crt" I am getting the following errors when that line is included in my config file: Apr 2 09:25:13 raspberrypi_pi-hole unbound[6522]: /etc/unbound/unbound.conf.d/pi-hole.conf:96: error: unknown keyword 'tls-cert-bundle' Apr 2 09:25:13 raspberrypi_pi-hole unbound[6522]: /etc/unbound/unbound.conf.d/pi-hole.conf:96: error: stray ':' Apr 2 09:25:13 raspberrypi_pi-hole unbound[6522]: /etc/unbound/unbound.conf.d/pi-hole.conf:96: error: stray '"' Apr 2 09:25:13 raspberrypi_pi-hole unbound[6522]: /etc/unbound/unbound.conf.d/pi-hole.conf:96: error: unknown keyword '/etc/ssl/certs/ca-certificates.crt' Apr 2 09:25:13 raspberrypi_pi-hole unbound[6522]: /etc/unbound/unbound.conf.d/pi-hole.conf:96: error: stray '"' It looks like either my syntax is incorrect or Unbound is not recognizing the tls-cert-bundle keyword. Thank you, RoC >
