Learn more about HAproxy Setting tune.ssl.default-dh-param to 1024 by default warning. Our HAProxy Support team is here to help you with your questions and concerns.

HAproxy Setting tune.ssl.default-dh-param to 1024 by default

According to our experts, the tune.ssl.default-dh-param setting in HAProxy is used to configure the size of the Diffie-Hellman (DH) parameters for SSL/TLS connections.

By default, this value is set to 1024 bits by HAProxy.

We can improve the security of our HAProxy configuration, by increasing the value of tune.ssl.default-dh-param to a stronger key size. This will boost the security of the Diffie-Hellman key exchange used in SSL/TLS handshakes.

If you have been coming across the “Setting tune.ssl.default-dh-param to 1024 by default” warning, you have come to the right place.

One way to resolve the issue is to set the tune.ssl.default-dh-param value to something larger than 1024 explicitly in the configuration file.

But, the HAProxy documentation recommends using custom Diffie-Hellman parameters since that approach is more secure. Hence, our experts recommend using this method instead.

1. 1. First, we have to generate a dhparams.pem file with the openssl utility.
   2. Then, add this to your global HAProxy configuration section so that frontend blocks will inherit the setting.
   3. We can generate the custom DH parameters, with this command:

      sudo openssl dhparam -out /etc/haproxy/dhparams.pem 2048
   4. Then, we have to configure HAProxy to use the custom DH parameters file.
   5. After that, we have to restart HAProxy so that it uses the new Diffie-Hellman parameters file.

After the above steps, the tune.ssl.default-dh-param warning will no longer appear.

Let us know in the comments if you need further help to resolve the “tune.ssl.default-dh-param to 1024 by default” warning error.

[Need assistance with a different issue? Our team is available 24/7.]

Conclusion

To conclude, our Support Techs demonstrated how to handle the HAproxy Setting tune.ssl.default-dh-param to 1024 by default warning.