Authentication Error

Hello, I'm hoping someone can help me with the following error. I running PHP 4.0 with Netscape Enterprise Server on a Sun box. When i try the following code I get an error. CODE !! <? if(!isset($PHP_AUTH_USER)) { Header("WWW-Authenticate: Basic realm=\"My Realm\""); Header("HTTP/1.0 401 Unauthorized"); echo "Text to send if user hits Cancel button\n"; exit; } else { echo "Hello $PHP_AUTH_USER.<P>"; echo "You entered $PHP_AUTH_PW as your password.<P>"; } ? ERROR MESSAGE !! [16/Jun/2000:11:42:17] failure (23511): for host xxx.xxx.xxx.xxx trying to GET / test/test.php, cgieng_scan_headers reports: the CGI program /usr/local/bin/php d id not produce a valid header (name without value: got line "http/1.0 401 unauth orized") This code is an example from the php documentation. Are there any configure options when setting up PHP that i might have missed ? Thanks for the help Joey