letsencrypt

This is the first time I'm trying to use an SSL certificate in a Django project. I take the certificate here (i.e., in fact ... rstand that you need to use the openssl utility, and do something with the ca_bundle.crt file, but I can't find what exactly.

When connecting the certificate via ISP Manager, the server selected DNS confirmations. The panel displayed this message: To ... 0sEn8 In the address to write dns1.hoster.net. or something from the above? If so, will one be enough, or do you need all 3?

We recently received a free SSL certificate from Let's Encrypt. We received it using the VMBitrix 7.2 virtual machine. We sta ... ll (on the iPhone it does not start, the error is attached). Are there any solutions to this problem? I attach a screenshot.