Some Tumblr feeds not working

[Metal-Mighty]

Tumblr seems to have changed how they generate RSS feeds for some blogs, and adding them in KRISS throws the following error.

I got this error by trying to add the following feed: http://raccoonshinobi.tumblr.com/rss
As a matter of fact, even the W3C validator won't validate this feed. Others (let's say, this one for example) will work just fine.
I also have yet to find a working rss feed for blogs served through HTTPS.

[tontof]

I guess the problem is linked to the specific tumblr because your first example is not publicly available as it needs a safe mode to activate:

This Tumblr may contain sensitive media.
Safe mode is on

Because of this KrISS feed or W3C validator can not access this feed. You probably can not see it in your browser because you are maybe connected to Tumblr without the safe mode ?