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ntlm: NTLM NGINX Module


You can install this module in any RHEL-based distribution, including, but not limited to:

  • RedHat Enterprise Linux 7, 8, 9
  • CentOS 7, 8, 9
  • AlmaLinux 8, 9
  • Rocky Linux 8, 9
  • Amazon Linux 2 and Amazon Linux 2023
yum -y install
yum -y install nginx-module-ntlm

Enable the module by adding the following at the top of /etc/nginx/nginx.conf:

load_module modules/;

This document describes nginx-module-ntlm v1.19.4 released on May 04 2024.

The NTLM module allows proxying requests with NTLM Authentication. The upstream connection is bound to the client connection once the client sends a request with the "Authorization" header field value starting with "Negotiate" or "NTLM". Further client requests will be proxied through the same upstream connection, keeping the authentication context.

How to use

Syntax: ntlm [connections];
Default: ntlm 100;
Context: upstream

upstream http_backend {


server {

    location /http/ {
        proxy_pass http://http_backend;
        # next 2 settings are required for the keepalive to work properly
        proxy_http_version 1.1;
        proxy_set_header Connection "";

The connections parameter sets the maximum number of connections to the upstream servers that are preserved in the cache.

Syntax: ntlm_timeout timeout;
Default: ntlm_timeout 60s;
Context: upstream

Sets the timeout during which an idle connection to an upstream server will stay open.


In order to run the tests you need nodejs and perl installed on your system

## install the backend packages
npm install -C t/backend

## instal the test framework
cpan Test::Nginx

## set the path to your nginx location
export PATH=/opt/local/nginx/sbin:$PATH

prove -r t


You may find additional configuration tips and documentation for this module in the GitHub repository for nginx-module-ntlm.