I’ve moved my server to a new hosting environment, and since then no certs can be renewed.
Renewal intervals set to 14 days for 20 sites.
Certify.exe is latest version.
Windows headless Server 2016 for IIS.
The log shows this Error: [ERR] The ACME service (directory) is unavailable.
From a test machine within that same environment these can be successfully accessed:
When you moved server did you copy some settings across for Certify or did you start with new configuration?
You mentioned you checked those URLs from a test machine, but did you check them from the same machine e.g. using powershell etc? A common fault is that Windows Firewall is blocking outgoing https.
The CheckDNS test is normally not enabled, you can disable DNS checks under Settings if you don’t need them.
Server Core (e.g. headless windows) is not a product we officially support but in general it should work.
The web servers involved are VMs on a blade. The blade was physically moved from one place to another, with new public IP’s for the webservers. DNS was updated, sites have been running since start Oct in new hosting environment and new public IP addresses. I only noticed the emails for renewal failure yesterday.