SSLHandshakeExceptioncauses a connection to a node to fail and indicates that there is a configuration issue. Some of the common exceptions are shown below with tips on how to resolve these issues.
java.security.cert.CertificateException: No name matching node01.example.com found
Indicates that a client connection was made to
node01.example.combut the certificate returned did not contain the name
node01.example.com. In most cases, the issue can be resolved by ensuring the name is specified during certificate creation. For more information, see Encrypt internode communications with TLS. Another scenario is when the environment does not wish to use DNS names in certificates at all. In this scenario, all settings in
elasticsearch.ymlshould only use IP addresses including the
java.security.cert.CertificateException: No subject alternative names present
Indicates that a client connection was made to an IP address but the returned certificate did not contain any
SubjectAlternativeNameentries. IP addresses are only used for hostname verification if they are specified as a
SubjectAlternativeNameduring certificate creation. If the intent was to use IP addresses for hostname verification, then the certificate will need to be regenerated with the appropriate IP address. See Encrypt internode communications with TLS.
javax.net.ssl.SSLHandshakeException: null cert chainand
javax.net.ssl.SSLException: Received fatal alert: bad_certificate
SSLHandshakeExceptionindicates that a self-signed certificate was returned by the client that is not trusted as it cannot be found in the
SSLExceptionis seen on the client side of the connection.
sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested targetand
javax.net.ssl.SSLException: Received fatal alert: certificate_unknown
SunCertPathBuilderExceptionindicates that a certificate was returned during the handshake that is not trusted. This message is seen on the client side of the connection. The
SSLExceptionis seen on the server side of the connection. The CA certificate that signed the returned certificate was not found in the
truststoreand needs to be added to trust this certificate.
javax.net.ssl.SSLHandshakeException: Invalid ECDH ServerKeyExchange signature
Invalid ECDH ServerKeyExchange signaturecan indicate that a key and a corresponding certificate don’t match and are causing the handshake to fail. Verify the contents of each of the files you are using for your configured certificate authorities, certificates and keys. In particular, check that the key and certificate belong to the same key pair.