If you receive an error like this:
Error: serverInternal :: The server experienced an internal error :: Error creating new authz
Right now practically all of these are caused by a DNS lookup timeout while validating your domain. The operations team is looking into it, and landing some additional metrics to pin down where the slowness is…
This class of error – Error creating new authz – doesn’t count against any of the rate limits, and it is safe to re-try. Chances are good that after a couple of retries that your certificate will issue successfully.
We’ll post back to this topic as we make progress nailing this down before General Availability. Thanks for your patience!