The link tag in the HTML HEAD part of the main document looks like this:
<link type="application/rss+xml" rel="alternate" title="Hudson:All (all builds)"
href="/rssAll"></link>
However, this doesn't take into account that the application is actually
deployed under the /hudson "directory" on the application server. I.e. the link
should look like:
<link type="application/rss+xml" rel="alternate" title="Hudson:All (all builds)"
href="/hudson/rssAll"></link>

This is for both the All builds and Failed Builds (along with the RSS2.0
version) links. The link icons within the page itself are fine.