Pb remote access MariaDB

Hi,

I use Kodi and sql data base (MariaDB) on NAS.
At home with LAN, it's alright

With Remote access (router port 3306 enable), kodi connect to sql data base but i can't play the movies (movie not found)

Video source is added with Webdav (https) protocol

is there a solution ?

I don't want to use Plex, Emby....

Thanks