smartfilter XL ? is that Astaro 8
or do you mean url filtering : Additional URLs/sites to block
We are using Astaro 7.511
There is no category smartfilter XL.
The link you presented was not categorized separately from http://www.startpagina.com/. As your Content Filter (HTTP/S) log will show, your URL was categorized as "Portal site" with "Minimal risk" - not as "streaming media."
The link in my post above is where you can check a URL and suggest a separate categorization for your radio URL.
I do not want to block al portal sites only streaming media. Why can Astaro the radio link not see as streaming media ? Now they can listen all day to the radio which is not allowed close all portal sites is not an option. We have to pay for that.