This is exactly what I ran into. It is described in the 2nd section at http://www.bashton.com/blog/20... [by Skaperen]
I tried to use the internal site redirection option of Directadmin, to point a site to a subdirectory.
So I made the redirect to http://www.domain.com/blog/
However, this is the result in the browser url bar (also without the trailing slash) when you visit http://domain.com
I want http://blog.domain.com/ to point to http://www.domain.com/blog
Just a notice, not to redirect to that location, but just point to it.
Also /blog is not a folder.