What free-full-trial ssl certificate can I get to test the server?

Question

Digital certificates

Hello! I'm testing a web server, or rather, a tls module. You need a full certificate for at least 10 days! Previously, I tested the server on a certificate from let`s encpypt, but some server functions cursed the absence of a crl file, for browsers on a computer this was not a problem, but for mobile browsers it was! those. they could not determine the authenticity of the certificate and as a result, probably (this is what I want to check), there was confusion in the negotiations (hanshake). Don't know about nginx | apache install it, maybe I'm dumb and I need to manually adjust fullchain.pem? Or tell me reliable companies where it is possible to get a free-trial certificate, preferably without installing any software. to receive, for example, by mail?

Answer 1

There are no problems with lets`encpypt. You just don't know how to cook

Answer 2

Cloudflare is the easiest way to get lets

Answer 3

lets`encpypt
Install using their apache \ nginx auto-configuration tool and wait for the domains (DNS)
to be updated Depending on the carriers, it can take up to a day...