phranque - 6:50 am on Jun 11, 2011 (gmt 0)
In my case I always get a server response 403 instead.
403 should be the response you get when you request a directory in which no DirectoryIndex has been specified or the default directory index document does not exist and "Options Indexes" has not been specified.
403 actually means Forbidden:
i assume that's what you mean by "access denied".
i would also assume that the xml document you are getting in response to your "Forbidden" request is a custom ErrorDocument: