126.96.36.199 - - [05/Nov/2015 18:45:24] "GET /.well-known/acme-challenge/MSMkci4W8m3ut6tgiwYajx77sZdBM75yUPqzQupx_CU HTTP/1.1" 200 - Failed authorization procedure. projects.wolflinux.org (dvsni): tls :: The server experienced a TLS error during DV :: Failed to connect to host for DVSNI challenge IMPORTANT NOTES: - The following 'tls' errors were reported by the server: Domains: projects.wolflinux.org Error: The server experienced a TLS error during DV To fix these errors, please make sure that your domain name was entered correctly and the DNS A record(s) for that domain contain(s) the right IP address. Additionally, please check that you have an up-to-date TLS configuration that allows the server to communicate with the Let's Encrypt client
I don’t know how, but it works now. Probably it needed some time.