I seem to be a bit further ahead BUT… it’s always something. I’m not using IIS (which I may have been using when I first got the cert) so that might explain why I have a valid cert now but cannot renew it.
Using ExpressJs (not my first choice) but it’s working. I added a path to the .well-known/acme-challenge folder on both port 443 and 80. I dropped a test.html file into it and I can access it via the website on either port. I had to permit dotFiles access (on Express) which I have and it is working.
For a confirmation test I created another folder “Test” told Express it can use it for static files also and that worked. So static files from alternate folders is enabled.
At this point I’m guessing that the Http Challenge Server is interfering. I tried turning it off but received the same error about the URL being inaccessible (I’m using the Test option). If I disable the challenge server that’s for all certificates which isn’t ideal. Only this one site is on a non-IIS server.
I’m going to reboot the server but I don’t believe it will have any affect in this case.