NGINX App Protect DoS Arbitrator Release 1.1.0

Here you can find the release information for NGINX App Protect DoS Arbitrator v1.1.0.

Arbitrator service release 1.1.0

December 1, 2021

This release is focused on security and stability.

New Features

  • Improve security by enabling the arbitrator to work as a non root user.

  • Remove operating system dependencies to work as a native service utilizing golang.

Resolved Issues

  • Special characters like slash inside the protected object name prevented Arbitrator to save the state file.

Important Notes

  • The current release upgrades Arbitrator service only. This change is agnostic to NGINX App Protect DoS functionalities.

  • proxy_request_buffering off is not supported.

  • gRPC and HTTP/2 protection require active monitoring of the protected service. The directive app_protect_dos_monitor is mandatory for these use cases, otherwise, attack will not be detected.

  • gRPC and HTTP/2 protection are available only on Debian 10, Ubuntu 18.04 and Ubuntu 20.04 platforms. For the rest of the platforms, NGINX App Protect DoS does not protect gRPC and HTTP/2 services. The traffic is bypassed.

  • TLS fingerprint feature is not used in CentOS 7.4 due to the old openSSL version. The required openSSL version is 1.1.1 or higher.

  • Slow POST attack always mitigates with block action while other types of attacks can also be mitigated with redirection or JS challenges.

  • New optional configuration parameters of the directive app_protect_dos_monitor to support gRPC and HTTP/2 protocols.

  • Added new fields in Security Log:

    • baseline_dps (datagrams per second) instead of baseline_tps, incoming_datagrams
    • successful_responses instead of successful_transactions
    • unsuccessful_requests instead of unsuccessful_requests_count.
  • In the case of upgrade from previous app-protect-dos version, it’s necessary to remove old nginx-plus and install new app-protect-dos that will install correspondent version of nginx-plus as described in the NGINX App Protect DoS Deployment Guide.


This documentation applies to the following versions of NGINX App Protect DoS: 1.1.0.