Remove underscore for the acme challenge record

Hi there,

I’ve found multiple topics on using underscore on fqdn record but it’s not clear for me.

Why continue to use underscore for txt record acme challenge ? Is it possible to change the default challenge by another one ? And not using any special char at the beginning of the record ?

Aurélien might give you some background.


Because a “host” domain name is not allowed to use the underscore character, this distinguishes the name from all legal host names


Expanding on @_az’s answer (Thanks!): It is not possible to change any aspect of the DNS-01 challenge. The structure of the challenge and TXT record are specified as-is by the ACME protocol.

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@_az is evidently an underscore expert. :slight_smile:


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