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With Little Snitch on my mac, I noticed that during TOR/TorButton use (latest version), little snitch says there's still an occasional DNS connection to my ISP. What's the purpose of this, is it a breach of my anonymity?

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There's no way we can know without seeing the packet traces. There are two possibilities:

  1. You aren't using tor through a proxy that forwards DNS. So all your DNS requests are bypassing tor.

  2. Other things going on are doing DNS requests that aren't being anonymized (and probably shouldn't be). Things like time synchronization, for example.

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