The ban prohibits using the Internet without a filter and recommends installing third party software that sends a record of all the Websites visited to a monitoring agency, which would then report that usage to a designated party.
Using a filter would stop haredim from visiting Websites with sexual content, but it would also prohibit them from visiting sites like FailedMessiah.com.
The ban is published in the name of Agudath Israel of America's Moetzet Gedolei HaTorah, its Council of Torah Sages, and is signed by its rabbinic leaders.
What follows is the ban and then an enlargement of the English section of the ban:
[Hat Tip: Frum Follies via The Other DK.]