I am on cPanel ver 116.0.10 with CCS Server Tools installed and working correctly. I am able to see and use the CalDAV calendar and CardDAV address book via both the Roundcube Webmail interface and third party clients such as Thunderbird.
I am trying to use a popular CalDAV / CardDAV adapter for Android called DAVx5 . However, DAVx5 is not able to ask the server for the actual collections of the given user.
The setup seems to be completed correctly since the debug info shows the account with the detected service URLs. So the Base URL seems to be the right one. After getting the services back from the server using the Base URL in the service detection, DAVx5 needs to ask the server for the actual collections of the given user. And DAVx5 gets a timeout and couldn't reach the server when doing this.
Response from the DAVx5 Support Team:
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