DNS problem: query timed out looking up A for domain

My domain is: ios.bitcoinfast.co

I ran this command: sudo certbot --nginx

It produced this output:
Obtaining a new certificate
Performing the following challenges:
http-01 challenge for ios.bitcoinfast.co
Waiting for verification…
Cleaning up challenges
Failed authorization procedure. ios.bitcoinfast.co (http-01): urn:ietf:params:acme:error:dns :: DNS problem: query timed out looking up A for ios.bitcoinfast.co


My web server is (include version): nginx 1.14.0

The operating system my web server runs on is (include version): Ubuntu 16.04

I can login to a root shell on my machine (yes or no, or I don’t know): yes

I’m using a control panel to manage my site (no, or provide the name and version of the control panel): no


Can you please check if you setup the correct DNS server?

The DNS server in your NS records is

However, the ns servers used to resolve your domain is:

Thank you

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