Flash Uploader Breaks with HTTP Authentication
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We have a fresh install of WordPress 2.8.4 (not an upgrade) and the flash based uploader fails with 'HTTP error' on the upload page in Firefox.
We do not use mod_security and I disabled all Firefox plugins I had installed as suggested by bug #10153 but the problem persists.
I found that the flash uploader fails with 'HTTP error' when HTTP basic authentication is enabled. The site that has this problem is a development site and we cannot remove authentication because the dev site is not legally approved for the general public.
For the record, here are the Firefox plugins I have installed:
User Agent Switcher
Incidently, WordPress does work with the above Firefox plugins when HTTP authentication is disabled.
The installed WordPress plugins are Akismet version 2.2.6 and Dagon Design Import Users version 1.2.