Error 520 with ipv6 but not on ipv4 and not on others domains

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no idea ?

Hello,

Sorry to hear you are having issues with 520s. A 520 is an error that we generate when we have a unexpected response from the origin such as the connection being closed or reset. When you observe these 520 errors where is the error being thrown on the error page? If you can paste a screenshot of this it will help us greatly. I would suggest if the error shows the host to see if you can check your access logs with the test requests you made to see if you can find the error on your origin or with your hosting provider. Below we have some items for you to check.

If this error is a Cloudflare error please create a ticket and share that # here as well. However, if you see it being generated at the host level that would mean the origin is generating this error not Cloudflare. So you would need to look at access logs to see what is happening.

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