Can't reach Plex Web App from DSM 6

Hello !

I hope that would be a right job for ninja ;-).
I’ve updated my Synology’s DS213j to DSM 6.0-7321.
I’m using Plex 0.9.16.3.1840-cece46d on it.

To install DSM 6 I had to disable Plex, then enable it again after upgrade.
And it work well as I can access it from my Smart TV (Samsung) and from my Android Apps without problems.
But I totally can’t access Web App, localy (http://192.168.0.x:y/web/index.html) and from remote access (https://app.plex.tv/web/app).
Both say that “The selected server can’t be securely contacted. An unsecure connexion can be possible” (translated by me from my french interface : “Le serveur sélectionné ne peut être contacté de façon sûr. Une connexion non sécurisée est peut-être possible.”).

Any known issues about that ? Any fix, please ?
Can’t find any topic about that (I hope I’ve searched it well).

Thanks for your help.

Fixed ! I renew my port setup with a specific one and it’s all good now.