Moving site from development to production

Problem Statement
-----------------
When browsing a php application, the IIS server randomly throws the
error message:

CGI Error
The specified CGI application misbehaved by not returning a complete set
of HTTP headers. The headers it did return are:
<BLANK>

Observations
------------
This happened only when:
- PHP.exe is used as a CGI on IIS
- The php scripts contained 2 or more frames (e.g. phpMyAdmin)
- MySQL operation was executed (update, insert, delete etc.)
- header("Location: ...") is used to redirect user after a MySQL
operation to a page that also performs a MySQL operation
- The pages are viewed from local computer
- A very fast computer is used

This did not happened when:
- Apache server for windows with php support was used
- The php scripts contained 2 or more frames but all frames contained
php scripts with Hello World and a random number
- Frequency of errors was much lesser when same pages were accessed from
the network
- Pentium 2, 300 MHz was used (a slow computer)

Content-Length: 232
Content-Type: text/html
Server: Microsoft-IIS/6.0
X-Powered-By: ASP.NET
MicrosoftOfficeWebServer: 5.0_Pub
Date: Mon, 05 Nov 2007 17:04:19 GMT

502 Bad Gateway