Certain sites block traffic from known exit nodes, and some sites simply show a CAPTCHA due to excessive abuse, etc.
Is there a list of websites known to be troublesome for visitors using Tor?
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This community wiki will list commonly used websites known to be troublesome for Tor users. These will be broken down into the following categories:
The purpose of this page is not to discuss fixes/workarounds.
If you have an update, make sure to follow the format that's been established, and the following guidelines:
4chan: Since at least 11th December 2013
Wikipedia: Since at least 8th January 2008
Mt.Gox: Warns users on signup: Attention: accessing your account via the Tor network and/or public proxies may result in a temporary suspension of your account, and having to submit documents for AML verification.8
Bitcoin Forum: User unable to signup or post messages: Spam. (Auto-ban.) You may appeal here: firstname.lastname@example.org . If you are using Tor, see https://bitcointalk.org/index.php?topic=99601.msg1089571#msg1089571
I've decided to test how well the top 50 websites work for Tor users, and to determine the pervasiveness of any blocking. I'm using a script that runs "torsocks midori -s http://foo.bar/" to snapshot sites. Midori is configured send a Firefox user agent string.
Results from the initial test series are here, and some exemplary histograms are here. I'll add additional text, highlighting the results, as I have time. I'll also update the image link as I include new data in the analysis.
Some websites (or services such as CloudFront) may serve rapidly loading CAPTCHA-challenge pages to Tor users. As Cammy_the_block has noted, this would skew my results, in that blocking in this way would increase apparent performance. However, I have not seen any CAPTCHA challenges in the snapshots that I've taken so far. If I do find a CAPTCHA-challenge snapshot for a given website, I can probably identify others based on size.