Bokko.nl

I found the solution here: http://forums.iis.net/t/1076662.aspx

Here is how to set the configuration with IIS 7.0:

%windir%\system32\inetsrv\appcmd set config -section:system.webServer/fastCgi /[fullPath='C:\php\php-cgi.exe'].activityTimeout:600

You need to change the 'C:\php\php-cgi.exe' to the actual location PHP that you registered with IIS.

If you want to make double-check that the configuration worked properly, you can check it like this:

%windir%\system32\inetsrv\appcmd list config -section:system.webServer/fastCgi