How to troubleshoot "java.security.cert.CertificateException:No subject alternative DNS name matching"?

Checks need to be performed:-

1.  CN name of the certificate imported in truststore.
2. A certificate is used for multiple services with different endpoints/hostnames. check for subjectAltName in the certificate. 
3. If subjectAltName is configured, verify the subjectAltName with the endpoint/hostname.