Challenge sometimes fails, because: Incorrect TXT record #3
Description
Issue Letsencrypt certs fails sometimes with
Challenge failed, because: Incorrect TXT record
Debug log shows:
acme.verify_order_challenge returned "invalid"
Looking closer, shows that server does not accept the challenge in use with
other altname of this cert. Authorization of other altname succeeds, while fails
with this altname. Both TXT RR show same hash in DNS.
This error happens always if NewOreder.contents shows a 2nd (historical)
Authorization.