Desktop client linux (debian 8 and 9) 64 bits NOK for few days


Under Debian 8 (PC) and Debian 9 (Laptop) on linux 64 bits my nextcloud desktop client (version 2.3.2) doesn’t work for few weeks !?
ID and password are OK
Open it in a browser or local folders are OK

When the desktop client is open it can’t connect to my server (OVH).
I did change anything.

For informations, webdav connexion NOK.

Any ideas ?