DNS problem: query timed out looking up A for

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My domain is: ws.ok9624.com

I ran this command: sudo ./letsencrypt-auto certonly --standalone

It produced this output:`Saving debug log to /var/log/letsencrypt/letsencrypt.log
Please enter in your domain name(s) (comma and/or space separated) (Enter 'c’
to cancel):ws.ok9624.com
Obtaining a new certificate
Performing the following challenges:
tls-sni-01 challenge for ws.ok9624.com
Waiting for verification…
Cleaning up challenges
Failed authorization procedure. ws.ok9624.com (tls-sni-01): urn:acme:error:connection :: The server could not connect to the client to verify the domain :: DNS problem: query timed out looking up A for ws.ok9624.com

IMPORTANT NOTES:

  • The following errors were reported by the server:

    Domain: ws.ok9624.com
    Type: connection
    Detail: DNS problem: query timed out looking up A for ws.ok9624.com

    To fix these errors, please make sure that your domain name was
    entered correctly and the DNS A record(s) for that domain
    contain(s) the right IP address. Additionally, please check that
    your computer has a publicly routable IP address and that no
    firewalls are preventing the server from communicating with the
    client. If you’re using the webroot plugin, you should also verify
    that you are serving files from the webroot path you provided.`

My operating system is (include version): ubuntu 14.04

My web server is (include version): nginx 1.4.6

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The DNS is not correct for that domain name - see http://dnsviz.net/d/ws.ok9624.com/dnssec/

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