Hello,
we are using 1.1.1.1 ad primary public DNS server but we have trouble reaching some domains, such as
dig sistemapiemonte.it @1.1.1.1
; <<>> DiG 9.9.4-RedHat-9.9.4-61.el7 <<>> sistemapiemonte.it @1.1.1.1
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 25129
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1452
;; QUESTION SECTION:
;sistemapiemonte.it. IN A
;; Query time: 4211 msec
;; SERVER: 1.1.1.1#53(1.1.1.1)
;; WHEN: Thu Jun 27 15:10:48 CEST 2019
;; MSG SIZE rcvd: 47
Regards.