Cloudflare "server failed" or timeout for some sites

Hi, I had this problem some months ago and it looks like it started again.

Cloudflare returns “Server failed” or some timeouts for some domains. It also happens when using DNS for families and also when using cloudflare for teams DNS resolver. Switching to Google DNS and this problem disappears.

Example (although I used IPV6 here it also happens when using IPV4):


nslookup oauth.bb.com.br 2606:4700:4700::1001

Server:  one.one.one.one

Address:  2606:4700:4700::1001

*** one.one.one.one can't find oauth.bb.com.br: Server failed


nslookup oauth.bb.com.br 2606:4700:4700::1111

Server:  one.one.one.one

Address:  2606:4700:4700::1111

*** one.one.one.one can't find oauth.bb.com.br: Server failed


nslookup oauth.bb.com.br 2001:4860:4860::8888

Server:  dns.google

Address:  2001:4860:4860::8888

Non-authoritative answer:

Name:    oauth.dc.bb.com.br

Address:  170.66.14.104

Aliases:  oauth.bb.com.br


nslookup oauth.bb.com.br 2001:4860:4860::8844

Server:  dns.google

Address:  2001:4860:4860::8844

Non-authoritative answer:

Name:    oauth.dc.bb.com.br

Address:  170.66.14.104

Aliases:  oauth.bb.com.br

As requested:


nslookup -class=chaos -type=txt id.server 2606:4700:4700::1111

Server:  one.one.one.one

Address:  2606:4700:4700::1111

Non-authoritative answer:

id.server       text =

        "GRU"


**nslookup -class=chaos -type=txt id.server 2606:4700:4700::1001**

Server:  one.one.one.one

Address:  2606:4700:4700::1001

Non-authoritative answer:

id.server       text =

        "GRU"

Sometimes it answers after timeout:


nslookup oauth.bb.com.br 2606:4700:4700::1111

Server:  one.one.one.one

Address:  2606:4700:4700::1111

DNS request timed out.

    timeout was 2 seconds.

DNS request timed out.

    timeout was 2 seconds.

Non-authoritative answer:

DNS request timed out.

    timeout was 2 seconds.

Name:    oauth.dc.bb.com.br

Address:  170.66.14.104

Aliases:  oauth.bb.com.br

Another Domain:

nslookup static-images.ifood.com.br 2606:4700:4700::1111
Server:  one.one.one.one
Address:  2606:4700:4700::1111

*** one.one.one.one can't find static-images.ifood.com.br: Server failed
nslookup static-images.ifood.com.br 2001:4860:4860::8844
Server:  dns.google
Address:  2001:4860:4860::8844

Non-authoritative answer:
Name:    e27065.dscb.akamaiedge.net
Addresses:  2600:1419::c888:246d
          2600:1419::c888:245b
          2600:1419::17cd:7f08
          2600:1419::c888:246e
          2600:1419::c888:2463
          104.88.205.73
          104.88.205.99
          104.88.205.56
          104.88.205.65
          104.88.205.82
          104.88.205.24
Aliases:  static-images.ifood.com.br
          www.ifood.com.br.edgekey.net

Another one:

nslookup mobi.bb.com.br 2606:4700:4700::1001
Server:  one.one.one.one
Address:  2606:4700:4700::1001

*** one.one.one.one can't find mobi.bb.com.br: Server failed
nslookup mobi.bb.com.br 2001:4860:4860::8844
Server:  dns.google
Address:  2001:4860:4860::8844

Non-authoritative answer:
Name:    mobi.dc.bb.com.br
Address:  170.66.2.27
Aliases:  mobi.bb.com.br

Help info:

https://cloudflare-dns.com/help/#eyJpc0NmIjoiWWVzIiwiaXNEb3QiOiJZZXMiLCJpc0RvaCI6IlllcyIsInJlc29sdmVySXAtMS4xLjEuMSI6IlllcyIsInJlc29sdmVySXAtMS4wLjAuMSI6IlllcyIsInJlc29sdmVySXAtMjYwNjo0NzAwOjQ3MDA6OjExMTEiOiJZZXMiLCJyZXNvbHZlcklwLTI2MDY6NDcwMDo0NzAwOjoxMDAxIjoiWWVzIiwiZGF0YWNlbnRlckxvY2F0aW9uIjoiR1JVIiwiaXNXYXJwIjoiTm8iLCJpc3BOYW1lIjoiQ2xvdWRmbGFyZSIsImlzcEFzbiI6IjEzMzM1In0=

This topic was automatically closed 30 days after the last reply. New replies are no longer allowed.