Post RSS Feed URL Not Working – 404 Not Found – New Permalink Structure

Hi all,

The problem in brief: my permalink structure is producing ‘404 Not Found’ errors for a the post RSS feed permalink (old structure), while the new structure works very nicely.

1) Here’s a URL that gives a 404 error:
my-site.com/341-what-a-lovely-post-title/feed/

2) Here’s a URL that correctly renders the post’s XML feed:
my-site.com/341/what-a-lovely-post-title/feed/

The first URL represents the permalink structure I used to use, while the second URL is my new structure.

OK, now here’s the [interesting] thing: URL (1) is redirecting very nicely to (2) IF one removes the ‘/feed/’ section, which is good of course, but why doesn’t the WP engine also do the same for the RSS feed?

To clarify:
– No error (redirects): my-site.com/341-what-a-lovely-post-title/
– No error: my-site.com/341/what-a-lovely-post-title/
– No error: my-site.com/341/what-a-lovely-post-title/feed/
– 404: my-site.com/341-what-a-lovely-post-title/feed/

So, old permalink structure to new is fine for the post, and the new RSS feed URL is fine too, but add the ‘/feed/’ suffix to the old permalink structure and it fails.

Can anyone shed any light?

Thanks