520 errors and slow responses in Kyiv region

From yesterday we sometimes have very slow responses (tens of seconds) and sometimes 520 errors on different sites and different DC.
Example ray ID: 5c4b3dbd09dd8247

A post was merged into an existing topic: 502 errors in Singapore

Problems have users with /cdn-cgi/trace colo=KBP , 520 error every other time. I have a colo=ARN and these same sites work without interruption.

520s are covered at Community Tip - Fixing Error 520: Web server is returning an unknown error.

Unless you generally have issue with all Cloudflare site through the Kiev datacentre, that wouldn’t be a Cloudflare issue but your host seems to block/limit requests from that datacentre.

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