When generating a CSR in Windows it seems to create a CSR header that looks like "-----BEGIN NEW CERTIFICATE REQUEST-----", but the addition of "NEW" breaks the parsing of the CSR. Making "NEW " optional fixes the problem.
Apparently certbot is tolerant of both forms, see: https://community.letsencrypt.org/t/error-parsing-certificate-request-resolved/40039/6 for more information.
```nginx
include conf.d/*;
include sites-enabled/*;
```
In this situation, after the first recursive `_checkConf` invocation 4 lines below, `$_c_file` does not contain what you expect anymore, and the second lookup checks for `conf.d/sites-enabled/*` which is obviously wrong.