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I have a WordPress website hosted by HostGator and I want a subdomain to redirect to my Application server. The problem is that after adding the subdomain (type “A” in the dns list I get a 521 error. After reading troubleshoot, I think the probable cause is the SSL configs, since the server is bare NGINX + Node.js hello world without ssl configs and typing the server IP in the browser it answers. The Cloudflare troubleshoot docs tells to configure a CA origin and I would need to pay annually to DigiCert, but I want it free using let’s encrypt. I couldn’t configure let’s encrypt, it returns this error (I faked the address for this post)

   Domain: www.aaa.bbb.ccc
   Type:   None
   Detail: DNS problem: NXDOMAIN looking up A for www.aaa.bbb.ccc -
   check that a DNS record exists for this domain; DNS problem:
   NXDOMAIN looking up AAAA for www.aaa.bbb.ccc - check that a DNS
   record exists for this domain
  • " I think the probable cause is the SSL configs" No it is not because you have an NXDOMAIN which is a DNS error, so you need to ask your DNS provider. Since you obfuscated (badly) everything, noone can help you. – Patrick Mevzek Nov 24 '22 at 15:37

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