Note: For ease of reading, this document refers to NGINX Plus, but it also applies to open source NGINX. The prerequisite ngx_http_auth_request_module module is included both in NGINX Plus packages and prebuilt open source NGINX binaries. The nginx-ldap-auth software is a reference implementation of a method for authenticating users who request protected resources from servers proxied by NGINX Plus. It includes a daemon (ldap-auth) that communicates with an authentication server, and a sample daemon that stands in for an actual back-end server during testing, by generating an authentication cookie based on the user’s credentials. The daemons are written in Python for use with a Lightweight Directory Access Protocol (LDAP) authentication server (OpenLDAP or Microsoft Windows Active Directory 2003 and 2012).