Access and upload impossible to my site

when i try to manage the site, i have this message :
“No active user session found. Please login.
This message usually occurs when accessing site builder directly per “”.
Site builder can be accessed only via hosting control panel by clicking site builder icon inside.”

Since 25/10/2019 at 15h25, it is impossible to upload from my computer to my site. Message on my computer by Filezilla
Statut : Résolution de l’adresse de
Statut : Connexion à…
Erreur : Connection interrompue après 20 secondes d’inactivité
Erreur : Impossible d’établir une connexion au serveur

(last upload one more at 30/10/2019 6h55)

what must i doing ?

Try Google Chrome for accessing the site builder it you’ve not already tried.

I’ve refreshed your FTP for you.