Tor uses a process called “onion routing”, and its name was originally an acronym for “The Onion Router”. We’ll explore how to detect Tor traffic, how to block it, and analyse whether blocking is a good approach. On the public internet, Tor is often used by credit card fraudsters to hide their true identity when they’re using stolen card information.ĭue to a large amount of illegal use, some internet providers and websites block access from Tor. These illegal sites, known collectively as the “dark web”, are only accessible using Tor using special links – for example, the original Silk Road URL was silkroad6ownowfk.onion. Due to this, it’s commonly used for illegal activities, such as purchasing weapons or drugs. The core ethos behind Tor is that internet users should have private access to an uncensored web. Zscaler does not block the TOR traffic, indicating that “block TOR traffic” button still does not work.Tor is commonly used to anonymise internet traffic. Tunnel 2.0 captures all traffic, however TOR Browser seem to “tunnel through” Zscaler. Zscaler URL control policies not applied. Tor Browser was able to access internet, ip. indicated “not connected to Zscaler”. Works more or less as expected, as traffic never hits Zscaler. TOR Browser uses different ports to connect og Guard/Entrynode (e.g, 9000, 9001, 9030, 4430…). ZCC Statistics ignored TOR traffic.Ĭonclusion: ZCC with Tunnel1.0 uses only 80&443.

TOR is blocked under advanced settings and I have tested with “classic” TOR Browser (download, install, execute) and Zscaler Client Connector. I stumbled over this thread when my customer asked how to block TOR.

Block tor download