Can't get unbound to do DoT

I'm trying to get my unbound server to handle DoT queries. I put this
in unbound.conf, restarted it, and it seems happy except that it doesn't
do DoT:

  # ssl stuff
  tls-service-key: /usr/local/etc/unbound/bethkey.pem
  tls-service-pem: /usr/local/etc/unbound/bethcert.pem
  tls-port: 853
  # for later
  tls-cert-bundle: /usr/local/etc/ssl/cert.pem

When I restart it, it says:

Starting unbound.
[1560705303] unbound[7166:0] debug: creating udp4 socket 192.168.80.2 53
[1560705303] unbound[7166:0] debug: creating tcp4 socket 192.168.80.2 53
[1560705303] unbound[7166:0] debug: creating udp4 socket 127.0.0.1 53
[1560705303] unbound[7166:0] debug: creating tcp4 socket 127.0.0.1 53
[1560705303] unbound[7166:0] debug: creating udp6 socket fe80::2 53
[1560705303] unbound[7166:0] debug: creating tcp6 socket fe80::2 53
[1560705303] unbound[7166:0] debug: switching log to syslog

Plenty of port 53 service, no port 853.

It's behind a NAT, but so are the clients. It's FreeBSD 12.0 running
the package, which is unbound 1.9.1. I looked at the port and I don't
see any options that would affect DoT.

The cert is self-signed, which I wouldn't think would be a problem.

We need to see your interface statements.

There needs to be a listen-statement for the 853-ports, too.

interface: 127.0.0.1@853

Rainer