linode's cloud firewall

We're aiming to have it available before the end of the year. You can sign up for the beta here:

https://www.linode.com/products/firewall/

I tried to join the test program, but did not get any response?

Thanks for signing up! Once the Cloud Firewall beta program is available, or any other betas you selected interest in, we'll be sure to let you know at the email provided.