I have just found out the Letsencrypt certificate on Windows (IIS 8.5) is showing an error:
“Your connection is not secure . . . .” in Firefox 45,46, . . . ??
Chrome is happy as far as I know. Safari is OK too. All on a mac. Chrome is good on windows, I.E is good on Windows. Anybody suffering the same problem?
Thanks in advance folks. Happy to try and troubleshoot further.