uTorrent ignoring BitTorrent options?

[mrlarge]

This is probably my ignorance, but I can't find an answer in this forum or google, so please help.

Using HTTP proxy (vidalia tor bundle). On the Connection page in Preferences, "Use proxy for hostname lookups", "disable all local DNS lookups" and "disable features that leak identifying information" all checked.

On the BitTorrent options page, ALL boxes unchecked, and encryption forced, and allow incoming legacy connections unchecked.

In that configuration, although sometimes a little slow to start, I can download/share most torrents with good speeds.

If, however, I check the Disable connections unsupported by the proxy box, everything stops.

From the user manual, I would expect all UDP traffic to fail with my current proxy setup once I check that box, but I'm not sure what UDP traffic uTorrent uses, given that I've unchecked all the boxes on the BitTorrent tab (so no UDP trackers, no DHT, no uTP).

Is uTorrent ignoring the settings on the BitTorrent tab, and falling back to a default of using UDP trackers and/or DHT, or is something else going on that I don't understand?

Thanks

[DreadWingKnight]

Using HTTP proxy (vidalia tor bundle).

We don't support or endorse the use of uTorrent with tor AT ALL.

Sorry, but that's the way it is.

[mrlarge]

I understand that, but that's not the question.

The question is what traffic is essential to the functioning of uTorrent that is excluded by unchecking all the boxes on the BitTorrent page and disallowing local DNS lookups but is not handled by an HTTP proxy?

Either that, or does uTorrent have a fallback position which ignores the options specified in the BitTorrent preferences tab?

Just trying to understand....

thanks

[DreadWingKnight]

udp traffic fails over to unproxied if the proxy you're using doesn't support it AND you've specified in preferences to allow communications the proxy doesn't support.

[mrlarge]

Thanks very much for that, but I think I understood about the proxy failsafe. What I don't understand is what UDP traffic is not disallowed by unchecking all the options in the BitTorrent tab (ie disallowing UDP tracker support, uTP, and DHT)?

[DreadWingKnight]

The only UDP traffic that happens directly from uTorrent when those options are disabled is UPnP and NAT-PMP (with the sole third possibility of local peer discovery). ALL of that traffic doesn't leave your local network, EVER.