Sorry to bump such an old thread but this one has good info in it. I am currently using vbSEO and the default sitemap program for my forum but I can't view the sitemap when I enter the path in the address bar.
www.forum.com/sitemap for example
I am getting an error message that says "403 Forbidden you do not have access to the server" or something like that.
I am concerned I am not generating sitemaps/or the search engines can't see them. I made sure I CHMOD 777 the /sitemap directory too