Today, Planet PostgreSQL was switched over from http to https. Previously, https was only used for the logged in portions for blog owners, but now the whole site uses it. If you access the page with the http protocol, you will automatically be redirected to https.
As part of this, the RSS feeds have also changed address from http to https (the path part of the URLs remain unchanged). If your feed reader does not automatically follow redirects, this will unfortunately make it stop updating until you have changed the URL.
In a couple of days we will enable HTTP Strict Transport Security on the site as well.
We apologize for the inconvenience for those of you who have to reconfigure your feeds, but we hope you agree the change is for the better.