[5.3] Sessions does not work in https but or ok in http

Hi, i am trying to upgrade a project from 5.2 to 5.3.

Onmy deployment server, i have 2 vhosts : one listening on port 80, redirecting (with RewriteEngine) to port 443 the other one onport 443, created by let's encrpt script.

On my developement pc, i only use port 80.

My problem is that when i use my app on port 443, session variables are not stored (authentification or other datas).

I tryed to modifiy the vhost definition on my deployment server, suppressing the redirection to 443, and black magically, everything works as intended...

Is there anything with laravel 5.3 preventing my https sessions to be stored ? or maybe are they recreated on eac request ?

the problem is the same with file and database drivers and everything was ok with laravel 5.2...

I feel lost... Thanks in advance for your help !