@rfc2822 Ok so, after asking to my hoster I successfully solved this problem by making some changes in the htaccess file and in my server configuration.
Now Davx5 actually connect to nextcloud, but when I try to sync I get an error “services detection failed - Impossible to refresh collections’ list” (I’m translating the message so it’s probably not exactly the same as in english).
Here is my Davx5 logs after that :
My Nextcloud logs does show something new :
[PHP] Error: PDO::query(): Error reading result set's header at /home/yunirucozj/www/nextcloud/3rdparty/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOConnection.php#104
from 220.127.116.11 by Admin at 2019-03-29T17:26:09+00:00
My web server logs contain this new line :
[Fri Mar 29 18:24:58 2019] [error] [client 18.104.22.168] [host cloud.yuniru.com] Script timed out before returning headers: index.php