PKIX路径验证失败：java.security.cert.CertPathValidatorException:连接memsql ssl db时签名检查失败异常

我正试图通过mule软件应用程序连接到SSL MySQL数据库，我已经获得了所需的证书并添加了相同的证书，但我得到了以下错误。请帮帮我

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签名检查失败的含义是什么？

证书的CN是否与您访问的主机名匹配？您是否在Mule中输入了IP而不是证书中指定的主机名？您确定已将正确的证书导入Mule app truststore吗？您的MySQL服务器可能具有不同的SSL证书。问候

%% Invalidated:  [Session-1, TLS_RSA_WITH_AES_128_CBC_SHA]  
[Memsql_ssl].TEST.worker.01, SEND TLSv1 ALERT:  fatal, description = 
certificate_unknown  
[Memsql_ssl].TEST.worker.01, WRITE: TLSv1 Alert, length = 2  
[Memsql_ssl].TEST.worker.01, called closeSocket()  
[Memsql_ssl].TEST.worker.01, handling exception: 
javax.net.ssl.SSLHandshakeException: 
sun.security.validator.ValidatorException: PKIX path validation failed: 
java.security.cert.CertPathValidatorException: **signature check failed** 
[Memsql_ssl].TEST.worker.01, called close()  
[Memsql_ssl].TEST.worker.01, called closeInternal(true)  
ERROR 2017-05-17 16:17:17,268 [[Memsql_ssl].TEST.worker.01] 
org.mule.exception.DefaultMessagingExceptionStrategy: