Hi, I have had the same problem for several days. Error 520 occurs randomly. I did not find any useful information in the logs. Website address: zawodtyper.pl
Not necessarily related to the 520 but assuming your server IP address ends in 37, you would have an invalid certificate on your server and an insecure encryption mode on Cloudflare.
How does the server IP relate to this? How did you validate the certificate?
Well, is that accurate?
In that case
Steps to fix that are mentioned at Why you should choose Full Strict, and only Full Strict
I changed the mode to Full strict but the 520 errors still occur.
What page is that? I can’t seem to find this on my “free plan” dashboard, probably only available to “pro” users?
So did I, of course these intermittent errors have nothing to do with SSL setup.
FYI, here’s the most popular/populous thread dedicated to those errors: Sometimes a CF 520 error
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