"NetworkError: 404 Not Found" - but file IS found

[Flora]

Screen grab: http://www.wind-watch.org/alerts/ifeedplusajax-404.png

This file loads fine in the browser: http://www.wind-watch.org/alerts/ifeedplusajax.php

But Firebug shows "NetworkError: 404 Not Found -
http://www.wind-watch.org/alerts/ifeedplusajax.php"

Why?

[Jan Honza Odvarko]

Wireshark shows that "404 Not Found" is exactly what comes from the server.
I would check the server side.
Honza

[Flora]

Thank you -- that clarification helped to focus my problem solving. It
turned out to be a Wordpress issue. Changing "require('wp-blog-
header.php');" to "require('wp-load.php');" at the start of the script
fixed it. It also restored the ajax ability that had been lost on a
recent move to a new host (which appears to have more security
running, such as suhosin.so).