I think Typo's config/routes.rb is something wrong.
For example,

view source of http://typo.example.com/articles.rss .

<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/css" href="/stylesheets/rss.css"?>
<rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:trackback="http://madskills.com/public/xml/rss/module/trackback/">
  <channel>
    <title>okkez weblog : </title>
    <link>http://typo.example.com/.rss</link> <!-- wrong line. -->
    <language>en-us</language>
    <ttl>40</ttl>
...

I tried to correct this problem.
Add this line in config/routes.rb .

  map.resources :articles

I cannot test enough about this.
I think that we need to check all named routes and rewrite.

regards.