Ladies and Gentlemen,
If you want to use the Atom feeds provided by this forum with authentication, e.g. because you are member of the beta group, you can use HTTP-based authentication as follows to get access to these boards via feeds:
Replace ‘username’ and ‘password’ with your user name and password, replace ‘url’ with the feed URL that you can e.g. get via the RSS button in Safari. Adding the ‘?auth=http’ (resp. &auth=http when you are using a URL for a specific board) parameter makes phpBB3 read the authentication from the URL.