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Re: ff & 2.0 (remote) dns leaks when using tor

lester psigal <lesterpsigal@xxxxxxxx> wrote:

> > Thus spake lester psigal (lesterpsigal@xxxxxxxx):

> >> i've got a setup for anonymous browsing using firefoxf and
> >> lately ff 2 with privoxy and tor (vidalia bundle 0.0.7) on windows xp sp2.
> >> the ff configuration option 'network.proxy.socks_remote_dns ' is set to
> >> true, the setting 'network.proxy.failover_timeout' is set to 50000 and
> >> the 'network.proxy.socks_version' is set to 5 but the ethereal logs show
> >> that firefox is still leaking dns requests, i.e. ff still does the
> >> lookups itself and does not delegate them to the proxy (which is not
> >> quite true: the dns requests are always delegated to the proxy and
> >> _sometimes_ to the local dns client too).
> >> to make it worse the leaks are occuring randomly (sometimes the remote
> >> dns works and sometimes not), so i'm guessing that it is a timeout issue.
> >> does ff fallback to local dns lookup when a remote lookup request is not
> >> answered in a timely manner or is it a failure with the os dns client or
> >> even a ff bug?
> >> what else could be done to prevent ff from dns leaking?
> >>
> >> any hints or suggestions would be very nice as it does not make any
> >> sense to me to operate a quite complex and complicated system for
> >> anonymous browsing when tracking of dns requests is all
> >> a profiling facility has to do...

> what i've forgot to mention that my installation of firefox uses
> torbutton 1.0.4 which is a firefox add-on preconfiguring the proxy
> settings for the vidalia bundle, that is http/s: localhost:8118
> and  socksv5 localhost:9050.

Can you reproduce the problem without any Firefox plugins that
influence the proxy settings?

A few weeks ago I shortly tested FoxyProxy and had similar experiences.
I used the "always use proxy xyz" feature to quickly switch between
different Privoxy versions, Firefox own settings were configured
to use Privoxy as well.

Directly after starting up, Firefox always ignored the proxy
settings and fetched some of the "live bookmarks" directly. The same
happened if there were still tabs open from a previous session.

I also had the feeling that it would randomly ignore the settings
later on, but I didn't use the plugin long enough to verify this.

I never used torbutton, but maybe it has similar problems.


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