503 errors in cloudflare but nothing in server logs

I’ve noticed a lot of errors in Cloudflare’s “error analytics”, mainly error 503. But I access the site all day and I don’t see anything. It’s all OK.

Also, in the server log does not display any error. It’s as if the error was displayed before reaching the server.

Server experts say it’s okay. I can’t see anything in the logs. What can I do?

Searching here on the forum, I found this topic about this report, but I don’t think it’s true.

Error 503 could be from JS Challenge issued to your visitors. Perhaps take a look at your firewall events?


yes, i disabled the bot combat mode. I hope that’s just it, thanks!

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