Project Euler Forum

I get this warning all the time, and it's making the site unusable:

To help us keep this website secure, please wait while we verify you're not a robot! It will only take a few seconds...

Loading...

Yes, I'm using a VPN and the problem goes away when I turn it off. But as a famous quote says,

Those who would give up essential <privacy>, to purchase a little temporary <Project Euler> deserve neither <privacy> nor <Project Euler>

--Benjamin Franklin

It pops up every few minutes. It pops up every time I click on a problem. It pops up when I visit my account page. It pops up when I submit a solution, and I have to do it again. It even popped up while writing this message, forcing me to type it again! It's ridiculous. No other website is this bad, even Stack Overflow.

This shouldn't be happening all the time for users who are logged in.

This is not something we have added/enabled. It must be happening at a higher server level as part of our hosts security measures. So I'm afraid this is something we have no control over.

Assuming it's 20i, they say (at https://docs.20i.com/web-hosting/what-is-stackprotect)

Once a visitor has passed the CAPTCHA check, their IP address is automatically whitelisted for 48 hours by all sites across the 20i platform.

which is definitely not the case, as it happens every few minutes. They also say

However, if you continue to be prompted with the CAPTCHA verification and believe the challenge should not be triggered for a particular user, then it’s possible that either the site is still under a HTTP flood – or your request is being flagged as suspicious.

In these cases, we’d recommend reaching out to our technical support team so that they can provide you with more information as to why your specific request is being challenged.

It might be worth contacting them and asking if they can clarify why you're experiencing repeated challenges. Assuming they're willing to engage with you, you're far better placed to answer specific question if they are willing to work on narrowing down the issue. There is a general contact form found here:
https://www.20i.com/contact