The unknown_ca keyword appears in the log, which means that the certificate verification fails. For example, the client may find that the connected server address does not match the domain name in the server certificate. There are many reasons, which may be analyzed in conjunction with the error reported by the client. The handshake_failure keyword appears in the log. The possible reasons are that the certificate type does not match the cipher suite, the cipher suite supported by both the server and the client was not found, and so on. The no_suitable_cipher keyword appears in the log, indicating that a suitable cipher suite was not found during the handshake process. The certificate_expired keyword appears in the log, indicating that the certificate has expired, please renew it in time. For the EMQX log related content, please refer to: Log and Trace. You can use the keywords in the EMQX log to perform simple troubleshooting. The client cannot establish an SSL connection with EMQX. Install Microsoft Visual C++ RedistributablePackage (opens new window) # SSL Connection Error # Phenomenon
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