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This article provides information about Peer-to-Peer (P2P) (Torrent) traffic in NTA.
All NTA versions up to and including NTA 4.1.2
It is normal that NTA does not show torrent traffic as this traffic cannot be categorized by NetFlow.
Torrents are designed to be difficult to monitor/police. Torrents use random ports, the data comes from many sources, etc. This makes it impossible to categorize without some sort of investigation into the packets.
NTA is adding support for NBAR2 in the upcoming release so this may help. If your Cisco device provides the information via NBAR2, NTA will be able to display it.