Please explain the problem in detail. What happens? What is the exact error messages?

This problem occurs for me only when I go to the website www.existe24.pl, and it lasts for around 5-15 seconds. It often asks for a captcha as well

laufer543 said

www.existe24.pl

The correct address is : www.exsite24.pl

Sorry YES

Some sites will do that to check if it is a valid attempt to enter their site, like here :

https://support.litebit.eu/hc/en-us/articles/115001319290-Checking-your-browser-before-accessing-LiteBit-Cloudflare

Also see :

https://forums.oneplus.com/threads/why-am-i-getting-a-checking-your-browser-before-accessing-message-before-entering-oneplus-net.336761/

And then there was someone who solved the problem :

https://support.mozilla.org/en-US/questions/1199606

(Note : I get the same message, and my time setting is correct)

I know nothing helped

laufer543 said

I know nothing helped

Maybe it will be explained a little bit better here :

https://security.stackexchange.com/questions/154975/what-is-the-website-checking-about-my-browser-to-protect-the-website-from-a-ddos/154979

Question though : do you get the same message over and over again on that site  ? I only get it when I first visit the site .....

over and over, for four months

this problem is only in fire fox, IE does not generate this message

laufer543 said

this problem is only in fire fox, IE does not generate this message

I just tried it (your link) using Edge and I got the same message and, just like when I use Firefox, only the first time I visit the site with that browser. If you keep getting that message every time you want to visit that site, there must be something going on that I can't put my finger
on (sorry .... ). Keeping my fingers crossed that someone else will come to your rescue ......

I've asked someone for help .....

Are you possibly using a computer with a lot of cores?

In such a case JavaScript can run asynchronously on more than one core and it is possible that there are timing (racing) conditions.

Any luck with Firefox Safe Mode and Private Browsing mode at the same time?

THXcor-el said

Are you possibly using a computer with a lot of cores? In such a case JavaScript can run asynchronously on more than one core and it is possible that there are timing (racing) conditions. Any luck with Firefox Safe Mode and Private Browsing mode at the same time?

Cloudflare use a cookie based challenge.

• [/questions/1216912] CloudFlare keeps repating browser check on Mozilla Firefox

The website creates a cf_clearance cookie when the challenge is resolved and the check finishes properly.

• https://blog.cloudflare.com/cloudflare-supports-privacy-pass/
• https://www.google.com/search?sa=N&num=100&q=cf_clearance

too difficult for me THX

Are you using any extensions that deal with (block) cookies?

no...