No problem Alberto, when removing this line the login system works so not big deal. New issue, the registration form doesnt even validate and it redirects to the main page no matter what i do in varnish config.
The varnish config file is a common file found on internet, not so special settings are required for my setup.
It’s not the plugin to blame, the plugin is fantastic, it’s solely a cookie issue.
I hope someone take a look at it and help me out.