OwnclCloud Behind Clodflare not working

Hello everyone
Has anyone faced this kind of issue, when you enable DNS Proxy for ownCloud Instance, laptop, Android and IOS clients stops working (syncing). I’m able to log on, but unable to list folders.

i’ve found similar issue here but no resolution was provided and that topic was closed and makrked as fixed

When it’s proxied thru on-prem ReverseProxy it work without any problem
On prem Reverse Proxy has a Let’s Encrypt SSL Certificate

Really
No one?

I’ve never used Owncloud so just some general things to try.

Assuming it doesn’t use any special ports, then check your security events log to see if any of the queries being made when accessing that page are blocked by the WAF, and then add the necessary exceptions to make it work.
https://dash.cloudflare.com/?to=/:account/security/events

You can also try to see if switching off Minification and Rocket Loader helps if you have those things enabled. (Nextcloud didn’t like Rocket Loader for me).

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