Learn how to deal with Cloudflare Java 8 Netty throws handshake_failure error. Our Cloudflare Support team is here to help you with your questions and concerns.

Cloudflare Java 8 Netty throws handshake_failure error

If you have been running into the “Cloudflare Java 8 Netty throws handshake_failure error” error message, our experts are here to help.

This error indicates an issue with establishing a secure connection with the Netty framework in a Java 8 application when communicating with a server protected by Cloudflare’s security and content delivery services.

Furthermore, the “handshake_failure” error usually happens during the SSL/TLS handshake process. This process is the initial negotiation between the client and the server to establish a secure connection.

Troubleshooting Tips

Let’s take a look at some of the reasons behind the error:

• SSL/TLS Version Incompatibility:

  The server may be using a more recent version of SSL/TLS that Java 8 does not support. In such cases, we have to update our Java 8 application to support a newer SSL/TLS version.
• Cipher Suite Mismatch:

  The server and the client have to agree on a cipher suite during the handshake. If the server uses a cipher suite that Java 8 Netty does not support, or if the cipher suite preferences are not the same, it can result in a handshake_failure error.
• Certificate Issues:

  Additionally, problems with SSL/TLS certificates can also lead to handshake failures. This includes expired certificates, certificates issued by untrusted authorities, or certificates with incorrect configurations. Hence, we have to make sure that the server’s SSL/TLS certificate is valid, correctly configured, and issued by a trusted certificate authority.
• Protocol Configuration:

  Then, it is time to check the SSL/TLS configuration in our Netty application. We have to ensure that it has the correct protocol, cipher suites, and other SSL/TLS settings.
• Firewall or Proxy Interference:

  Network intermediaries like firewalls or proxies can sometimes interfere with SSL/TLS handshakes. We have to confirm that our network configuration allows SSL/TLS traffic to pass through Cloudflare without interruption.
• Cloudflare Security Policies:

  Cloudflare offers different security features like security policies to block or restrict access based on certain criteria. Sometimes, a security policy in Cloudflare may be blocking our Java 8 Netty application’s connection attempts.

Our experts recommend updating the Java 8 runtime environment with the latest security updates and patches to resolve the issue.

Let us know in the comments which one of the above troubleshooting tips will help us resolve the handshake_failure error.

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Conclusion

In brief, our Support Techs demonstrated how to fix the Cloudflare Java 8 Netty throws handshake_failure error.