I’ve released two updated versions of the http-authentication plugin, for better compatibility with certain PHP setups on Apache:

• 2.2, for WordPress 2.6
• 1.8.1, for WordPress 2.0

You can download either version from the WordPress plugin directory.

The updated versions add support for the REDIRECT_REMOTE_USER environment variable that you may see with PHP running as a CGI or running under FastCGI with a ScriptAlias configuration.