522 and 523 time out errors


We are seeing a very interesting issue.

We are testing our multisite solution. Our sub sites have 2 types of URLs:

We found that whenever we map a subsite to a custom domain it will slow down significantly. And often we run into 522 and 523 errors.

This very seldom happens to subsites using our domain.

We have placed our main domain behind Sucuri DNS while keeping the custom domains on Cloudflare.

Any insights what might go wrong?

Sucuri DNS is not free, but their firewall is a better deal.

Thanks a lot for any insights you can provide.


Hi @gujingc,

Take a look at these two CommunityTip on reported errors:

Unfortunately, I won’t be able to help you with the non Cloudflare issues.

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Thank you so much!

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