I am using the getssl script and want to switch to DNS validation. I changed the settings in the getssl.cfg and tested the procedure successfully with a new subdomain. However, for all my existing domains the script tells me, “xxxx is already validated”, which is correct because it was validated before by the HTML method. However, I want it revalidated by the DNS. How can that be done?
you must deactivate your challenges.
You can find details there:
7.5.2 Deactivating an Authorization
But your client must support that, so (using #client-dev) you have to create a command.