I have a load balancer with 3 IIS servers both using DFS for keeping their local filesystem synchronized.
Let’s say server 1 has Certify and manages the certs. When the http challenge is performed, the /.well-known/acme-challenge/ http request may income on server 2 or 3, in this case, it seems DFS has not propagated the challenge file yet, resulting in a failure.
I’ve noticed that creating an properly named empty file in /.well-known/acme-challenge/ after the failure occurs makes the second challenge successful… Not fairly easy…
So my question is : Is there a way to prevent the clean-up of the acme-challenge file (or clean-up after a certain amount of time…) ? Or to delay the challenge request (30 seonds should be enough…) ?
Thanks for your answers,