Why Am I Getting an \'Unrecognized SSL Message: Plaintext Connection\' Error?

Unrecognized SSL Message: Plaintext Connection Error

Encountering an "Unrecognized SSL message, plaintext connection?" exception when attempting to establish a secure connection with an HTTPS server suggests an unsecured connection attempt. This error typically occurs due to a misconfiguration between the client machine and the remote server.

Troubleshooting this issue involves verifying that the connection is configured correctly:

• Confirm HTTPS Protocol: Ensure that the server is listening on the HTTPS port (typically 443) and that the client is attempting to connect using the HTTPS protocol.
• TLS/SSL Certificate: Verify that the server has a valid TLS/SSL certificate installed. The client should trust the certificate authority that issued the server certificate for the connection to be considered secure.
• Truststore Configuration: Check that the client's Java Runtime Environment (JRE) truststore contains the trusted certificates of the server's certificate authority. This ensures that the client can verify the server's certificate.
• Keystore Properties: Examine the keystore properties for the client connection. If the client requires a specific keystore for authentication, ensure that the correct keystore is configured and the necessary trust certificates are present.
• Cipher Suites: Review the cipher suites supported by both the client and server. If compatible cipher suites are not negotiated, the connection may fail to establish securely.

By addressing these configuration settings, you can ensure a secure connection with the remote HTTPS server and resolve the "Unrecognized SSL message, plaintext connection?" exception.

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