Error access webdav after october update in vero4k

I have a vero4k+ and since the October update I can no longer access my nas in webdav.
i created a log file if someone could help me.
thank you

errors start at : 2020-10-20 09:04:04.716

Failed: HTTP returned error 400
Maybe the authentication method not supported. Have you tried from command line to access the server?

I specify that I have not modified anything for several months and that its no longer works since the last update.
I don’t know at all how to connect to my server from the command line.