502 error on PageSpeed Insights, Pingdom etc

First of all, thank you for a great service!

I have just started using free version of Cloudflare on my website. Since changing the DNS, I am seeing only 502 error in every pagespeed test (pingdom tools, pagespeed insights, gtmetrix).

The website is working for me. What could be the problem?

Cheers and thanks!

And the domain is?

The site generally loads fine for me, but I also get some timeouts for it on http://sitemeer.com/#https://csgo-tutorial.com. Particularly the French and the German checkpoint.

Not all of the tools you mentioned return an error me as well, but Pingdom does for example. Could it be that your server is overloaded and cant serve too many concurrent requests? Do you get anything in the error logs?

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