javax.net.ssl.SSLPeerUnverifiedException: peer not authenticated

javax.net.ssl.SSLPeerUnverifiedException: peer not authenticated
        at sun.security.ssl.SSLSessionImpl.getPeerCertificates(SSLSessionImpl.java:450)


This exception happens when the client cannot validate the certificate sent by the server during handshaking.


To fix this problem

1. If you are using a self-signed certificate, get the certificate from the server and click HERE to see the steps and sample code to make it work. If a certificate is not issued by any of the Certificate Authorities (CA), it is a self-signed certificate.

2. Check if your certificate is expired.

3. The client is using an old encryption protocol that is not supported by the server. You can force the client to use the TLSv1.2 protocol.

      SSLContext sc = SSLContext.getInstance("TLSv1.2");

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