Error: ORA-28865: SSL Connection Closed with Oracle Wallet

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Ensure that the SSL versions on both the client and the server match, or are compatible. Sometimes this error occurs because the SSL version specified on the server and client do not match. For example, if the server accepts only SSL 3.0 and the client accepts only TLS 1.0, then the SSL connection will fail.

If you are using a Diffie-Hellman anonymous cipher suite and the SSLVerifyClient directive is set to require in the ssl.conf file, then the client does not pass its certificate to the server. When the server does not receive the client's certificate, the server cannot authenticate the client so the connection is closed. To resolve this, use a different cipher suite, or set the SSLVerifyClient directive to none or optional.

Enable Oracle Net tracing and check the trace output for network errors.