Description:
------------
Calling fopen("http://...") or file_get_contents("http://...") causes IIS6 to fail in a number of ways:

If anon access is disabled (password required to view site), then IE will ask for a new password constantly (never accepts).

If anon access is enabled then the page just bombs out with a "no data returned" browser error.

Degrading to 4.4.1 fixes the issue

Reproduce code:
---------------
<?
$Data=file_get_contents("http://www.bizhot.co.uk/sbnxmlfeed/sbudistribute.xml");
die($Data)
?>

Expected result:
----------------
contentes of website to be printed to the screen

Actual result:
--------------
Either stuck on password request or browser bombs out with "no data returned"