DNS Challenge Caching

I've seen a couple previous posts on this, but can't find an official answer anywhere. Once a DNS challenge is successful is there a period of time where that response is cached for subsequent challenges, or will a new response be necessary every time?

Related topic:

Hi @derak!

Once successfully completed, an authorization is cached for 30 days as long as subsequent requests use the same ACME account key.

This is officially documented here:



Note that the limit may get shorter in the future, e.g. 7 days.


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