I did disable the option in the API-write module, and now it's working in a shell terminal when I send the above CURL command.
But when I try to use CURL in HTTPS within my PHP program,
I get this message (401) : A valid login session was not found. Please log in and try again.
I don't understand why I get this message, because :
I'm sending the Master token in the Header by calling the PHP function curl_setopt with the option CURLOPT_HTTPHEADER
I try to send the credentials (login/password) by calling the PHP function curl_setopt with the option CURLOPT_USERPWD and login/password.
@abhinov-singh If you are using Nginx on Ubuntu, the configuration files or symlinks (including ports, etc.) are at /etc/nginx/sites-enabled/
See also which ports are left open by your firewalls (server, PC).