Why am I getting an SSLHandshakeException \'no cipher suites in common\' error when connecting to my server?

Understanding the Problem: SSLHandshakeException "no cipher suites in common"

The SSLHandshakeException indicates an error during the handshake process when establishing a secure connection over SSL/TLS. The specific error message "no cipher suites in common" occurs when the client and server cannot agree on a cipher suite for encrypting and decrypting data.

Analysis of the Question:

The provided information includes an example code of a Java SSLServerSocket initialization and debug logs of the SSL handshake. However, there are some gaps in the question that make it difficult to provide a specific solution:

• We cannot directly observe the code that initializes the client SSLSocket that is attempting to connect to the server.
• The debug logs show a successful SSL connection with another server, which suggests that the error may be specific to the connection with the asker's server.

Possible Causes:

Based on the given information and common pitfalls, possible causes for the handshake failure include:

• Mismatched cipher suites: Ensure that the client and server support at least one common cipher suite.
• Certificate issues: The server's certificate may not be trusted by the client, or the client may not present a valid certificate if mutual authentication is required.
• Key store configuration: The Java Key Store (JKS) or KeyManager used to initialize the SSLServerSocket may not be properly configured with the appropriate keys and certificates.
• Security provider settings: Check that the Java security provider (e.g., SunJSSE) is correctly installed and configured.

Suggested Approach to Resolve the Issue:

To resolve the issue, consider the following steps:

1. Compare cipher suites: Check the supported cipher suites on both the client and server. Ensure that there is at least one common cipher suite that is enabled and supported by both parties.
2. Inspect certificates: Verify that the server's certificate is trusted by the client and that the client presents a valid certificate if required.
3. Review key store configuration: Ensure that the JKS or KeyManager is correctly initialized with the necessary keys and certificates.
4. Check security providers: Verify that the java.security.providers property in the Java runtime is properly set up with the preferred security provider for SSL/TLS.
5. Capture additional debug logs: If possible, capture debug logs from both the client and server during the SSL handshake process to get more detailed insights into the failure.

Additional Tips:

• Use standard JVM options for TLS such as -Djavax.net.debug=ssl,handshake,session for detailed logging.
• Refer to the Java documentation on SSLServerSocket and related classes for proper configuration.
• Consider using a TLS testing tool to analyze the handshake process and identify potential issues.

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