For some reason, on September 13th, I've got an RSS error (in my RSS reader) from most of the feeds of the Moodle forums. A quick investigation showed that the the URL of "RSS feed of discussions" (presented in the "Administration" area of each Moodle forum) changed.
here is the old URL of the "Themes" forum RSS feed:
and here is the new URL:
When you try to use the old URL, you get the text "Your RSS link does not contain a valid authentication token".
Do you know what is the reason for that? I'm subscribed to these RSS feeds for a month or so - Do these links change periodically?!