I would love some help on why my phpBB board is get so many 404 errors. Well actually let me explain it seems to work fine if you accessing it from a web browsers. But if I try to you a sitemap generator crawler it doesn't even make it across index.php before spitting out a 404 error. I'm also getting the same problem from Googles crawler and a couple auto crawlers on my wordpress side of my site. I have done lots of testing and narrowed down the problem to when I began using the WordPress plugin "phpBB Single Sign On". This plugin allows my users to register on the forum or wordpress and be registered on both as well as signing on in one and being logged in on both. This plugin changes phpbb's authentication style to wpbb. I'm not sure what about this plug in knocked out the use of spiders and crawlers but I need to have this plugin installed and would like to open up access for the crawlers and spiders to access my site as well.
My Site is: http://darintheurer.com
The plugin is: http://wordpress.org/extend/plugins/phpbb-single-sign-on/