How to Fix "gnutls_handshake() failed" Error in Akka-HTTP TLS Connection with Curl

Learn how to address the "gnutls_handshake() failed: The TLS connection was non-properly terminated" error that occurs when using Akka-HTTP with Curl. Solutions involving Scala code, keystore configurations, and other troubleshooting tips are discussed.
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How to Fix "gnutls_handshake() failed" Error in Akka-HTTP TLS Connection with Curl

When working with Akka-HTTP and secure connections, you may encounter an error like:

[[See Video to Reveal this Text or Code Snippet]]

Understanding this error can be crucial for anyone dealing with secure connections, especially when using Curl to test or interact with an Akka-HTTP server.

Root Cause

This particular error indicates that the TLS handshake process between the client and the server was not completed correctly. This can happen due to a variety of reasons, but it often circles back to:

Misconfiguration in the TLS/SSL setup.

Problems with the certificate or keystore.

Issues with the Akka-HTTP server configuration.

Steps to Fix the Error

Here, we’ll walk through several troubleshooting steps to resolve this issue:

Verify Certificates and Keystores

Ensure that the server’s certificates are correctly set up and not expired. Using a keystore improperly configured can lead to failed handshakes. Verify the keystore path, password, and alias settings in Akka-HTTP.

Check Akka-HTTP Configuration

Check your Akka-HTTP configuration to ensure the TLS setup is correct. Here is an example configuration snippet:

[[See Video to Reveal this Text or Code Snippet]]

Make sure these paths and passwords correspond to your keystore correctly.

Update Curl

Sometimes, the version of Curl you are using may have issues with certain types of gnutls libraries. Updating to the latest version of Curl can sometimes resolve these issues.

Testing With OpenSSL

If problems persist, test the handshake using OpenSSL instead of Curl to determine if the problem is specific to Curl:

[[See Video to Reveal this Text or Code Snippet]]

This can help isolate whether the issue lies with Curl or Akka-HTTP.

Conclusion

By carefully checking certificates, keystore configurations, Akka-HTTP settings, and the versions of your tools, you can successfully solve the gnutls_handshake() failed error. Accurate diagnosis is crucial, as TLS errors can originate from various points in the setup.

Remember, consistent testing and updates can help keep your system running smoothly, protecting it from both operational and security issues.

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