Same situation in Bullseye, no DoH in Unbound due to lack of nghttp2. May 3 20:59:34 instance-1 systemd[1]: Starting Unbound DNS server... May 3 20:59:34 instance-1 unbound: [1483:0] notice: init module 0: subnet May 3 20:59:34 instance-1 unbound: [1483:0] notice: init module 1: validator May 3 20:59:34 instance-1 unbound: [1483:0] notice: init module 2: iterator May 3 20:59:34 instance-1 unbound: [1483:0] warning: HTTPS port configured, but no TLS tls-service-key or tls-service-pem set May 3 20:59:34 instance-1 unbound: [1483:0] warning: Unbound is not compiled with nghttp2. This is required to use DNS-over-HTTPS. May 3 20:59:34 instance-1 systemd[1]: Started Unbound DNS server. May 3 20:59:34 instance-1 systemd[1]: Condition check resulted in Unbound DNS server via resolvconf being skipped. May 3 20:59:34 instance-1 unbound: [1483:0] info: start of service (unbound 1.13.1).