It always amazes me when I learn the advanced home networks some people set up. Charlie Kindel has set up DFS in his home, and wrote a nice entry in his blog about some of the troubleshooting he had to do. If you're having problems accessing a domain DFS namespace, check out Charlie's entry. The problem may simply be that the DFS service is turned off on one of your domain controllers.

http://kindel.com/blogs/charlie/posts/259.aspx