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6

Any captcha system can be broken by paying people. The captcha has been attacked in the past by a nationstate adversary. The captcha isn't critical to the security of Tor, it does present problems for censorship circumvention. Breaking it would net you a subset of the bridges on bridgedb, it is partitioned so that a break on any one of the distribution ...


3

Yes. This for me happens only with Tor. I have tested multiple VPN and browser configs and the only combination that got the "please try again" error was Tor. Furthermore sometimes even when the captcha is solved I get the message "That reCAPTCHA did not work. Please try again."


3

Many identified exit nodes have been blacklisted on some websites, and your current exit node is on that blacklist. You could try changing your exit node, but honestly in the end you're just going to have to deal with the Captchas.


3

Well, a "captcha case" is quite common one using Tor. You need to change the exit node to try again - the problem is that there're not-so-much-as-needed exits and you can hit a hevily-used exit node, or an abused one. So - just change it and try again! it's a trial-and-error approach, nothing else. A control protocol command is "SIGNAL NEWNYM"


2

If the captcha is via CloudFlare you're probably out of luck. I've got through 30+ captchas and then gave up. It's a known issue that CloudFlare seems very reluctant to remedy. It's not a Google issue (this time).


2

Another workaround is to modify the URL so that it begins with https://www.facebookcorewwwi.onion/ - that's Facebook's official .onion address, and the CAPTCHA works there.


2

I can reproduce this, I think it's actually a bug in facebook's captcha mechanism. From what I can see, it's requesting /tfbimage.php?captcha_challenge_code=foo&captcha_challenge_auth=bar and that request is itself receiving a redirect to /login.php?next=<the previous URL for the captcha image> which obviously doesn't return a captcha image. ...


2

Use recently launched Tor Exit Node The workaround is to hand pick a Tor Exit Node that is very new on the Internet (launched hours ago). We only need this for the signup step. It is critical to revert to default Tor settings afterwards. Search for exit nodes first seen 0 days ago: https://metrics.torproject.org/rs.html#search/flag:exit%20flag:running%...


2

It doesn't matter whether you use a bridge or not. You're experiencing a coincidence, not some actual relation between using bridges or not.


1

It's not clear if that story is true or not: https://krebsonsecurity.com/2014/09/dread-pirate-sunk-by-leaky-captcha/ https://krebsonsecurity.com/2014/10/silk-road-lawyers-poke-holes-in-fbis-story/ But generally, your onion service can directly leak personal information in two ways: Onion service connects to a third-party server without connecting through ...


1

You can switch to an Invidious instance. Invidious is an alternative, open source front-end to YouTube.


1

I had the same issue. I lowered the security slider to the lowest level, did the reCaptcha, then slid it back to where I had it before. It works every time for me, give it a try.


1

What was the previous TBB version doing that I wasn't seeing so many Cloudflare captchas? According to these two comments from arma and gk, the fix was on Cloudflare's side, and they haven't updated it for Tor Browser 7.0. Apparently Cloudflare had done some hack on their side to handle Tor Browser better (i.e. trigger fewer false positives), but ...


1

it seems that some sites like Cloudfare and Google are mass-accessed through your exit point. Use "SIGNAL NEWNYM" command to forcibly change your exit and try again.


1

You can use Tor to access this stack exchange, but you will likely trip their "defenses" and have to complete captchas, human verifications, and then your post might get flagged as spam so you can't even submit it. While that's a heaping load of irony, none of that is an insurmountable set of obstacles to posting here using tor or the tbb. Once you get in ...


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