For reference, here's what it took for me to get things working for a php script that prints dynamic xml via a SSL [https] connection...
<?php header('Cache-Control: cache, must-revalidate'); header('Pragma: public'); Without the latter headers, the flex app *would* work under FireFox but always throw a stream error #2032 in IE6. Keep in mind it there seem to be two bugs in IE that throw the #2032 error... IE + SSL (HTTPS) + XML + [No] CACHE Or IE + GZIP Compression I spent far too much time googling, so I hope this helps someone out. For more info see this reference http://www.dirtystylus.com/blog/? p=17