There was a feature request for a UDT recently for an automated port shutdown, if the connected endpoint is on the "black list".
What would be your other reasons, for which would you want to shut down the port? Lets's go our imagination wild and imagine events like user device infected by a non-deletable virus, peer-to-peer software installed, firewall disabled? Feel free to vote for Other and leave comment. By liking the specific comments you can vote for other ideas.