qBittorrent official forums

Hi gentlemen,
I have a problem using qBittorrent and Mozilla VPN.
I can use and navigate with Mozilla VPN working but cannot use qBittorrent with Mozzilla VPN, even if I applies some parameters found in forums about how to setting this two software together.
I asked Mozilla for help, but the only thing they advise is to use qBittorrent without changing the standard settings. I did this at the very beginning, no connection possible, so I looked for how to set up qBittorrent without success. Anyone have the settings to use to be able to use qBittorrent with this VPN? Thanks in advance.

You shouldn't need any special settings if your VPN is setup correctly. What distro/desktop you running? Also in qBittorent settings under advanced what do you have set as well as options for under "Network Interface" & Optional IP address to bind to". And are you using any sort of firewall, I'm not familiar with Mozilla VPN - how do you connect to it, through OpenVPN/Wireguard or do they have some kind of dedicated application? What is your qBittorent port setting, and are you able to check if that port is listening with: ?

I've checked and re-checked, tested and re-tested, de-installed and reinstalled Mozilla VPN and qBittorrent (*)...
Now everything is working fine but I've must modify some parameters to reach this result.
Sorry, I don't given a lot of information, my apologies...
Xubuntu 20.04, no firewall, Mozilla VPN 2.6.0-focal1, qBittorrent v4.1.7.
Mozilla VPN settings : no change

qBittorrent settings :
Connexion : port 50160, fixed
Advanced / Network Interface : moz0

netstat -tulnp is now listening port 50160
(*) about de-installation of qBittorrent, even I use
sudo apt remove qbittorrent --purge
When re-installing, I've found all torrents and setting I have had previously, is it normal ?