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Compatibility & Requirements

access_time Updated Sep 21, 2021

The Signal Sciences Agent and Modules are supported on the following Linux distributions:

Distribution Code Name Version
Alpine 3.11
Amazon Linux >2015.09.01
CentOS Enterprise Linux 6 6.x
Enterprise Linux 7 7.x
Enterprise Linux 8 8.x
Debian Wheezy 7.x
Jessie 8.x
Stretch 9.x
Buster 10.x
Red Hat Enterprise Linux 6 6.x
Enterprise Linux 7 7.x
Enterprise Linux 8 8.x
Ubuntu Precise 12.04 LTS
Trusty 14.04 LTS
Xenial 16.04 LTS
Bionic 18.04 LTS
Disco 19.04 LTS

Only 64-bit environments are supported. If you need 32-bit support contact us.

Signal Sciences Module

The Signal Sciences Module is a lightweight module that integrates with your web server software or application and is the interface between incoming requests and our agent process. We support NGINX, Apache, and IIS web servers, the HAProxy proxy server, and several application languages (including .NET, Golang, Java, Node.js, Python). Specific details for some of the more commonly deployed platform are listed below:

NGINX Web Servers

The NGINX Module is offered in two different variations, depending on the platform and what best meets your needs:

C Binary

The NGINX Module is available in a variation built as a C binary, which requires no dependencies. Versions of Nginx-org supported by the C binary are:

  • 1.19.0
  • 1.18.0
  • 1.17.9
  • 1.17.8
  • 1.17.7
  • 1.17.6
  • 1.17.5
  • 1.17.4
  • 1.17.3
  • 1.17.2
  • 1.17.1
  • 1.17.0
  • 1.16.1
  • 1.16.0
  • 1.15.12
  • 1.15.10
  • 1.15.9
  • 1.15.8
  • 1.15.7
  • 1.15.3
  • 1.14.1
  • 1.12.2
  • 1.10.3 (on Ubuntu 16.04 only)

Versions of Nginx-Plus supported by the C binary are:

  • 22-1(1.19.0)
  • 21-1(1.17.9)
  • 20-1(1.17.6)
  • 19-1(1.17.3)
  • 18-1(1.15.10)
  • 17-1(1.15.7)

These C binary versions are kept up-to-date with stable releases and on demand for mainline releases.


Alternatively, a variation of the NGINX Module as Lua is available, which requires NGINX to be built with Lua and for LuaJIT support.

This version is written in Lua and requires your NGINX binary to be compiled with the third party ngx_lua module enabled. We also require the ngx_lua module be linked against the LuaJIT just-in-time byte code library for performance.

NGINX deployments vary from organization to organization, and we support two approaches to this installation:

  • Pre-built binary packages - for all the OS platforms we support we provide three flavors or pre-built NGINX packages that are built with the required ngx_lua module.
  • Source builds - for those organizations building NGINX internally from source, we have published our reference build guidelines that can be used to review and adapt for your own build process.

If you currently use a pre-built binary package of NGINX, either from the operating system’s package collection or from the official NGINX package repositories let us know, and we can provide a suitable replacement package built with our required supporting modules. Contact us for more information.

The Lua variation of the NGINX module is supported on the following versions of NGINX:

Release Versions
1.0 1.0.15
1.1.19 1.1.19
1.2 1.2.7, 1.2.9
1.4 1.4.6
1.6 1.6.0, 1.6.1, 1.6.2
1.7 1.7.2, 1.7.4, 1.7.7, 1.7.8, 1.7.9
1.8 1.8.x
1.9 1.9.x
1.10 1.10.x
1.11 1.11.x
1.12 1.12.x

Apache Web Servers

Our Apache module is distributed in binary form as an Apache shared module and supports Apache version 2.2 and 2.4.

Microsoft Windows Servers

  • IIS 7 or higher, Windows Server 2008R2 (Windows 7) or higher (64-bit)
  • .NET 4.5 or higher

We currently only support 64-bit and 32-bit application pools on Windows 2012 or higher. We only support 64-bit application pools on Windows Server 2008R2.

Additionally, we only support 64-bit OSes. For older or 32-bit versions of Windows, it is possible to deploy the Signal Sciences Agent as a reverse proxy. If you have questions or require assistance with older or 32-bit versions of Windows, reach out to our support team.

HAProxy proxy Servers

Our HAProxy module is written in Lua and requires your HAProxy binary to be compiled with the lua module enabled.

Our module is supported for HAProxy 1.7+

Note: Although supported, there is a known issue with HAProxy 1.8 that may result in performance issues when the Signal Sciences module is installed. HAProxy has fixed this issue with HAProxy 2.2, but the fix will not be backported to 1.8. It is recommended to upgrade to HAProxy 2.2 or higher if possible, or use an alternate Signal Sciences deployment method (e.g., reverse proxy agent if HAProxy 1.8 must be used).


0.10 or higher


  • Java 1.8 or newer
  • Spring version 2.x
  • Spring Boot Tomcat Starter 2.x
  • Spring Boot Starter WebFlux 2.x
  • Tomcat 8


Our PHP module is available both as a tarball and a PEAR package to simplify installation. The minimum version of PHP supported is 5.3.