However, if a security certificate is present, why it may not be appropriate? It may be infected with viruses, so it is not recommended to switch to it. One of the reasons for the error is the complete absence of a certificate from the site. When does SEC_ERROR_UNKNOWN_ISSUER occur? If the certificate does not match the database or it simply cannot be verified for any reason, then Firefox issues a SEC_ERROR_UNKNOWN_ISSUER error code along with a message like “This connection is untrusted,” trying to protect the PC from a dangerous connection to the resource. The Mozilla Firefox browser always checks the validity of the certificate that the securely connected site provides (in particular, starting with https).
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