bbPress.org

The reason for this is that you bbPress/forum pages are returning a header of 404 (Not Found) instead of 200 (OK).

Date: Fri, 01 Aug 2008 00:29:52 GMT

Server: Apache

X-Powered-By: PHP/4.3.9

X-Pingback: http://www.sanzdrave.cz/xmlrpc.php

Expires: Wed, 11 Jan 1984 05:00:00 GMT

Last-Modified: Fri, 01 Aug 2008 00:29:52 GMT

Cache-Control: no-cache, must-revalidate, max-age=0

Pragma: no-cache

Keep-Alive: timeout=2, max=20

Connection: Keep-Alive

Transfer-Encoding: chunked

Content-Type: text/html; charset=UTF-8



404 Not Found

But the page is clearly there. You need this fix:

https://bbpress.org/forums/topic/bbpress-wordpress-mu-or-not-leads-to-404-errors-but-pages-still-load

Also described here:

https://bbpress.org/forums/topic/strange-404-report-i-firebug#post-9551