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Proxy leak: uT and BitT leak info about destination thru Tor


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uTorrent 3.1.3 - (build 27498) (32-bit)

Windows XP SP3.

Tor Version 2.2.37-2

PeerBlock 1.1

Windows XP firewall - uTorrent (and BitTorrent) are unblocked

(If necessary, I'm considering installing Comodo firewall, or maybe ZoneAlarm Free.)

Tor proxy works fine for its locked-down version of the Firefox browser.

But when uTorrent (or BitTorrent) is started, the Tor Message Log flashes every second:

Potentially Dangerous Connection!

One of your applications established a connection through Tor to 'nnn.nnn.nnn.nnn:nnnnn" using a protocol that may leak information about your destination. Please ensure you configure your applications to use only SOCKS4a or SOCKS5 with remote hostname resolution.

These messages come in every second. Closing uTorrent (or BitTorrent) stops them. Browsers don't start them.

I think that the leak may possibly be related to uTorrent, although that is purely conjecture on my part. Just a wild guess. (Donning fire-retardant suit.)

In uTorrent (or BitTorrent), Preferences > Connection has these settings CHECKED:

Enable UPnP port mapping

Enable NAT-PMP port mapping

Randomize port each start

Add Windows Firewall exception

Socks5 9050 (same as Tor)

Authentication is NOT checked

Use proxy for hostname lookups

Use proxy for peer-to-peer connections

Disable all local DNS lookups

Disable features that leak identifying information

Disable connections unsupported by the proxy

In uTorrent (or BitTorrent), Preferences > BitTorrent has these settings CHECKED:

Enable DHT Network or disable, doesn't matter

Enable DHT for new torrents or disable, doesn't matter

Enable Local Peer Discovery

Enable bandwidth management [uTP]

Enable UDP tracker support

Ask tracker for scrape information

Enable Peer Exchange

Protocol Encryption

Outgoing: either Disabled or Enabled, doesn't matter

Allow incoming legacy connections

I suppose I should (and will) close uTorrent (and BitTorrent) until further notice.

Thank you for this excellent app.

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