Error: HTTP POST failed (HTTP 502 Bad Gateway ) tried everything

Hi,

I am using gallery for many years now and had very little problems. recently i upgraded my server ( complete new one) and also installed win2003.
got al of my websites running, including the gallery ones ( more then one) and there seemed to be no problems i couldn't solve.

A couple of days ago i wanted to upload some new photo's to one of the gallery's and i got the "Error: HTTP POST failed (HTTP 502 Bad Gateway )" error.
So i went on to your forums and support and tried everything i found here to solve the problem, but with no succes.

I hope there is someone that can help me out here.

The following information is required to get an answer:
Get this information from the PHP diagnostic (in the configuration wizard).
Gallery URL (optional but very useful):http://foto.jansil.nl
Gallery version:1.67
Apache version:no apache
PHP version (don't just say PHP 4, please):php 5.1.2
Graphics Toolkit:netpbm, but have imagemagick installed as well
Operating system:Win 2003 with all the latest service packs
Web browser/version (if applicable): firefox and IE
Webserver loaction : on my own lan