Unable to connect via webdav

Hi, I’m started with Duplicati. I’ve downloaded last on ubuntu 18.04 LTS.
I want to backup my laptop to a synology using webdav protocol.
Webdav server is configured with https and anonymous is not activated.
I have a synology DNS with certificate.
I can access to webdav without trouble from ubuntu (nautilus).
But when i try to create a backup with duplicati, I 'm obtaining an error :
Failed to connect: The remote server returned an error: (400) Bad Request.
What I’m doing wrong ?
Note: duplicati configuration using http is working

What version of mono do you have installed on your Ubuntu 18.04 machine? Mono 5.10 or higher is required. You can get the latest from the offiical Mono repository. Also, you may need to do a cert-sync with mono, for example # cert-sync /etc/ssl/certs/ca-certificates.crt

Hi, Sorry for the delay. Finaly it’s working doing the following
( Download - Stable | Mono)
sudo apt install gnupg ca-certificates
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
echo “deb https://download.mono-project.com/repo/ubuntu stable-bionic main” | sudo tee /etc/apt/sources.list.d/mono-official-stable.list
sudo apt update
sudo apt upgrade
sudo apt install mono-devel
sudo cert-sync /etc/ssl/certs/ca-certificates.crt

=> not working
reboot and the next it’s working

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Great, glad you got it working!