DOMAINQ BLOG
Start with what you need.
ACME account keys and certificate keys may use the same accepted algorithms, but they are not interchangeable. Plan account arrangements and certificate use on recreated frontends with that separation in mind.
After a DNS change, the result may be an old record value, NXDOMAIN, or NODATA. Learn what each response means and why it may remain cached.
Start interpreting an RDAP result with the HTTP status code and JSON structure before reading object fields. This helps distinguish successful queries, unsupported query types, and invalid requests.
The right RDAP starting point depends on the target of your question: a domain, one nameserver, or a set of search results.
HTTP-01 depends on web server access and port 80, while DNS-01 depends on automated DNS TXT record updates. Choose based on your infrastructure’s access and permission boundaries.
A field missing from an RDAP response does not by itself mean that no record exists. Review data scope, authorization, and the queried object type together.
A 556 reply after RCPT may concern whether the target host accepts mail connections, rather than one individual mailbox. The reply timing and code identify the right first check.
More than one TXT record can exist under the same DNS-01 name. But as old records accumulate, the DNS response can grow and Let’s Encrypt may reject it.
When menus or buttons do not respond, narrow the issue down systematically, from browser extensions to the full JavaScript console error message.
