Thank you all for your return.
Qbitorrent torrent has again paused, no download and uloapder possible!
About the version this is V4 1 6.
port 80 is ok;
"Your ISP is not blocking port 80"
On the application below it is mentioned: "Connection status: Offline This usually means that Qbitorrent could not listen on the port defined for incoming connections"
A priori even those outgoing do not work.
Any help will be welcome, thank you
I think I understood:
In Option, Advanced, I changed the selection of the network interface because I realized that it had changed with my VPN.
I connected it on a network that does not work, and miraculously the incoming connections start to work.
In addition, my antivirus is asking permission from Qbitorrent to contact HOST.patch.

which seems to be a windows script ...