disqus/disqus-wordpress — pull request #14 by peterschilling (2012-01-14 01:08:55+00:00)
Title: Prevent Google Webmaster Tools from incorrectly reporting 404 errors

Google Webmaster Tools incorrectly parses links to /forum/, this should fix that.

A thread on users with this issue:
http://wordpress.org/support/topic/plugin-disqus-comment-system-crawl-errors-with-plugin