transport error - Could not connect to ssl://xxxxx (0)

[PaceyIV]

I have the "remote" DokuWiki on a low power PC on debian.
HTTPS is enabled with a self-signed SSL certificate for localhost.
When I connect to my dokuwiki using https I've get a warning of insicure connection (the browser say that the certificate is invalid) but all works. On the browser I have the chance to add and exception and still use this certificate.

I think that this plug-in can't connect to the dokuwiki for this reason.
Is there a workaround?

[PaceyIV]

I've get a digital signet from Let's Encrypt for free with this tutorial https://hblok.net/blog/posts/2016/02/24/lets-encrypt-tls-certificate-setup-for-apache-on-debian-7/