Brazil Claro/Net Virtua: can't connect to certain websites

1.1.1.1 help: https://cloudflare-dns.com/help/#eyJpc0NmIjoiWWVzIiwiaXNEb3QiOiJObyIsImlzRG9oIjoiWWVzIiwicmVzb2x2ZXJJcC0xLjEuMS4xIjoiWWVzIiwicmVzb2x2ZXJJcC0xLjAuMC4xIjoiWWVzIiwicmVzb2x2ZXJJcC0yNjA2OjQ3MDA6NDcwMDo6MTExMSI6Ik5vIiwicmVzb2x2ZXJJcC0yNjA2OjQ3MDA6NDcwMDo6MTAwMSI6Ik5vIiwiZGF0YWNlbnRlckxvY2F0aW9uIjoiR1JVIiwiaXNXYXJwIjoiTm8iLCJpc3BOYW1lIjoiQ2xvdWRmbGFyZSIsImlzcEFzbiI6IjEzMzM1In0=

I’m often unable to connect to websites such as folha.uol.com.br (other *uol.com.br subdomains too) and idpcafe.usp.br. Generally, if I refresh multiple times, I’m able to connect, but the problem reappears later. My ISP is Claro, also known as Net Virtua.

dig idpcafe.usp.br

; <<>> DiG 9.11.24-RedHat-9.11.24-2.fc33 <<>> idpcafe.usp.br
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 9298
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 65494
;; QUESTION SECTION:
;idpcafe.usp.br. IN A

;; Query time: 46 msec
;; SERVER: 127.0.0.53#53(127.0.0.53)
;; WHEN: seg nov 23 14:09:07 -03 2020
;; MSG SIZE rcvd: 43

dig folha.uol.com.br

; <<>> DiG 9.11.24-RedHat-9.11.24-2.fc33 <<>> folha.uol.com.br
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 36704
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 65494
;; QUESTION SECTION:
;folha.uol.com.br. IN A

;; Query time: 27 msec
;; SERVER: 127.0.0.53#53(127.0.0.53)
;; WHEN: seg nov 23 14:12:38 -03 2020
;; MSG SIZE rcvd: 45

traceroute folha.uol.com.br
folha.uol.com.br: Nome ou serviço desconhecido
Cannot handle “host” cmdline arg `folha.uol.com.br’ on position 1 (argc 1)

traceroute folha.uol.com.br
traceroute to folha.uol.com.br (2804:49c:319:430::339), 30 hops max, 80 byte packets
connect: A rede está fora de alcance

Hi @alexkforte,

Sorry about this. .uol.com.br should be working now. For idpcafe.usp.br, the zone doesn’t seem to setup correctly: https://dnsviz.net/d/idpcafe.usp.br/dnssec/.