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
Speaking of the 404’s this is worryingly more common than should be with bbPress for some reason. I’ve found a few dozen installs like that during my top100 spidering (out of 3000 so it’s a small number but still).
I wonder if bbPress could detect if it’s serving 404 response headers or if that happens outside of PHP so it’s not possible to detect.
I wish I understood more about why it actually happens on integrated installs. Is it when you include bbPress in WordPress, or the other way around?
