Cannot obtain or renew certs

Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. https://crt.sh/?q=example.com), so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.

My domain is: zfx.com

I ran this command: certbot --nginx -d my.uat.zfx.com

It produced this output: Detail: DNS problem: SERVFAIL looking up A for www.uat.zfx.com -
the domain’s nameservers may be malfunctioning

My web server is (include version): nginx version: nginx/1.14.0 (Ubuntu)

The operating system my web server runs on is (include version): Ubuntu 18.04 LTS

My hosting provider, if applicable, is: self

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

The version of my client is (e.g. output of certbot --version or certbot-auto --version if you’re using Certbot): certbot 0.31.0

I can’t renew or obtain new certs, my dns provider is dns.com and they say that everything is fine.
I tried from different nginx’s from Russia, China, and HK with no luck. I receive SERVFAIL or no IP addresses. Please help!

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Hi @mkolobov

your name servers are buggy. Or the name server software is expired - see https://check-your-website.server-daten.de/?q=my.uat.zfx.com

X Fatal error: Nameserver doesn’t support echo capitalization: v1.dns.com
X Fatal error: Nameserver doesn’t support echo capitalization: v1.dns.com / 119.167.180.133
X Fatal error: Nameserver doesn’t support echo capitalization: v1.dns.com / 218.98.111.204
X Fatal error: Nameserver doesn’t support echo capitalization: v1.dns.com / 27.152.186.195
X Fatal error: Nameserver doesn’t support echo capitalization: v1.dns.com / 2404:da80::1:1a6
X Fatal error: Nameserver doesn’t support echo capitalization: v2.dns.com / 121.12.104.116
X Fatal error: Nameserver doesn’t support echo capitalization: v2.dns.com / 183.253.57.195
X Fatal error: Nameserver doesn’t support echo capitalization: v2.dns.com / 42.157.225.197

If the query is My.uAt.Zfx.cOm, the answer must be the same, not my.uat.zfx.com. That’s a name server requirement using Letsencrypt.

See

https://tools.ietf.org/html/draft-vixie-dnsext-dns0x20-00

Rechecked with Unboundtest - the same problem - https://unboundtest.com/m/A/my.uat.zfx.com/JUONPBE6

Query results for A my.uat.zfx.com

Response:
;; opcode: QUERY, status: SERVFAIL, id: 13025
May 24 11:08:53 unbound[6114:0] info: query response was REFERRAL
May 24 11:08:53 unbound[6114:0] info: wrong 0x20-ID in reply qname

Change your name servers. If this isn’t possible, it may be impossible to create a Letsencrypt certificate.

PS:

No, there is nothing fine. It’s a name server problem. The draft is from 2008, so every name server software must support echo capitalization.

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