What causes an Error 400 when running php on IIS?

Last updated: 06/29/2009

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When installing php on IIS, you may get an Error 400 trying to run any php scripts.

Edit php .ini and change the following setting:

; cgi.force_redirect is necessary to provide security running PHP
 as a CGI under
; most web servers.  Left undefined, PHP
 turns this on by default.  You can
; turn it off here AT YOUR OWN RISK
; **You CAN safely turn this off for IIS, in fact, you MUST.**
cgi.force_redirect = 0

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What causes an Error 400 when running php on IIS?