javax.net.ssl.SSLException: Unsupported record version Unknown-0.20

After you started your server and client are connected, you try to read data and you see the following exception.

javax.net.ssl.SSLException: Unsupported record version Unknown-0.20

        at sun.security.ssl.InputRecord.checkRecordVersion(InputRecord.java:552)

        at sun.security.ssl.InputRecord.readV3Record(InputRecord.java:565)

        at sun.security.ssl.InputRecord.read(InputRecord.java:529)

        at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:975)

        at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1367)

        at sun.security.ssl.SSLSocketImpl.readDataRecord(SSLSocketImpl.java:931)

        at sun.security.ssl.AppInputStream.read(AppInputStream.java:105)

To fix this exception:

1. Check if both the server and the client are connecting through SSL/TLS. If one end is using SSL/TLS and the other side is not, it will throw such an exception.

2. Make sure that both sides are using the same encryption protocol such as TLSv1, TLSv1.1, TLSv1.2,  or SSLv3. When you transmit using an SSL/TLS Socket, it calls a formatting and encryption routine to create the encrypted packet. It then calls the plain sockets layer to transfer the encrypted packet to the server. The server's sockets layer receives the packet and then calls the SSL/TLS package to decrypt the packet. If the packet doesn't fit the SSL/TLS format, you get the unsupported version exception.

3. The version of java you are using supports the encryption protocol.

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