`Not trusting let`s encrypt certificate
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<div class="content__item-top-div"> <a class="content__item-top-name" href="#!">Danil Tunev</a><span class="content__item-top-p">2018-05-16 04:38:56</span></div>
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<a class="content__item-top-category" href="/category/digital-certificates">Digital certificates </a>
<div class="content__item-row dn"> <a href="#!"><b>Danil Tunev</b>,</a> 2018-05-16 04:38:56</div>
<p class="content__item-title large">Not trusting let`s encrypt certificate?</p>
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Until that time, I thought that cert.pem and privkey.pem were the only files to install until I looked at the site on mobile and little-known browsers, they simply do not trust the certificate, So I think that the other two files that are loaded when receiving a certificate via certboot organize the "path" trust on which it is possible to check authenticity of the certificate by the browser? correct me if I'm wrong!
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<div class="content__item-img large name-color-M"><span>M</span></div><span class="answer__name"><a href="#!">Maxim Grishin</a>, 2018-05-16 <br/> @lada-guy</span>
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<p class="answer__detail">The site (TLS server in general) must itself provide a full chain of certificates confirming its own, excluding the root CA certificate, which is normally in the trust store on the client. So yes, in addition to cert.pem, you also need to give fullchain.pem. The reason is that the client normally does not need to know about the entire PKI infrastructure of each CA whose root certificate it holds, since it is generally dynamic, and subordinate certificates are still reissued every 1-5 years (LE with its three-month certificates may change subCA once a year), so the client has nowhere to get the entire chain of certificates. Therefore, the most logical solution is to store it on the server, since he must also know who signed the certificate for him, and distribute it from the server as needed.</p>
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<div class="content__item-img large name-color-D"><span>D</span></div><span class="answer__name"><a href="#!">Denis</a>, 2018-05-16 <br/> @sidni</span>
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<p class="answer__detail">Often you need to register intermediate CA certificates, then mobile devices will not throw out the warning</p>
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<div class="content__item-img large name-color-C"><span>C</span></div><span class="answer__name"><a href="#!">CityCat4</a>, 2018-05-16 <br/> @CityCat4</span>
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<p class="answer__detail"><blockquote>cert.pem and privkey.pem are the only files</blockquote><br>
Not only are they not the only ones, but they can even be called completely arbitrarily :) In addition to the key files and the key certificate , there is <b>always</b> a file of the publisher's root certificate, or a chain of the publisher's certificates leading to its root certificate. This root certificate is stored in a special store called the trusted root certificate store. The system automatically trusts any certificate if it is able to trace the issuer back to the certificate in the root certificate store. The question is, where does the browser get information about root certificates :) <br>
Donkey, Opera, Chrome, YaB - use the Windows system storage <br>
FF has its own storage<br>
To resolve the issue with the trust of a certificate from LE (as well as any other) - you need to know where it takes the data about root certificates from and, if necessary, add them there</p>
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