How does the newsgroup filtering work?
If you are blocking the “Web Based Newsgroups” category, users will not be able to connect to most web sites that offer access to newsgroups. If you also want to prevent users from being able to use newsgroup-reading software installed on their PCs, you can have the R3000 block TCP port 119 (NNTP). To block specific ports, go to Group -> Global Group -> Minimum Filtering Level -> Port.