PHP HTTP Authentication, Win2k & IIS

<apologies if this came through yesterday as well, I never saw it propogate though> Hello All, I am experimenting with HTTP authentication in IIS 5.0 on a Windows 2000 SP3 server with PHP 4.3.0. PHP is installed as an ISAPI module both as a filter and an application mapping (both point to the php4isapi.dll). All forms of authentication are turned off in IIS (anonymous access only). I am using the php.ini-dist with only the /extensions directory changed. It appears to me that the user/pass I enter is never getting through to PHP. I've tried authentication examples from http://www.zend.com/zend/tut/authentication.php as well as http://www.planet-source-code.com/vb/scripts/ShowCode.asp?txtCodeId=252&lngW Id=8 with no luck. (btw, tested on a friends BSD/Apache, worked fine [a simple test from the zend.com page]) Thanks!