If your server set-up does not support passing 401 authentication information to PHP, you can use URL Based Authentication for RSS Feeds and iCalendars instead.
To enable URL based authentication, choose this option in your Server Settings.
How it Works
When using 401 authentication, most RSS and iCalendar software will prompt you for your username and password. This is not the case if you use URL based authentication.
Instead of being prompted for you username and password, you need to add the username and password into the URL when you subscribe to the RSS Feed or iCalendar, like this:
If you already have arguments being passed to the URL, it might look like this:
rss.php?username=[your username]&password=[your password]
rss.php?view=upcoming&username=[your username]&password=[your password]