I followed the approach by JeffTheRocker some time ago to set up Let’s Encrypt on my OSX Server (5.3.1 OSX 10.12.6). All has worked fine, through several renewals until the current when I get:
Thank you, I was not able to get the file with curl - I do not have wget available.
After digging in a little, I should add I am far from an expert, I thought it might have something to do with the approach I initially used to obtain the certificate so changed from the JeffTheRocker approach to a pure homebrew approach as described here.
Worked perfectly - all now up and running correctly