PHP_AUTH_USER not set?

Hi, I'm beginning with PHP and have problem where PHP_AUTH_USER does not seem to be set. Not sure if this should be sent to install list, but anyway. - PHP 3.0.13 - Debian 2.0.36 - Apache 1.3.12/SSL 1.39 I've followed all the examples to the letter: if(!isset($PHP_AUTH_USER)) { // Username and Password must be present Header("WWW-authenticate: basic realm=\"test realm\""); Header("HTTP/1.0 401 Unauthorized"); exit; } else ... But, authorization always fails and it keeps popping up the username/password dialogue. I.e. it seems as if PHP_AUTH_USER is never set. Thought it may be with options for php build, and rebuilt a few times: lastly with ./configure --with-mysql --with-apxs=/usr/local/apache/bin/apxs --with-xml --with-apache=/usr/local/apache_1.3.12 --enable-track-vars --enable-debugger Everything else works, access is using SSL, PHP works, dynamically loaded module. But I can't figure out why PHP_AUTH_USER is not getting set??? Any ideas on how I can debug this? thanks, ed