on a newly installed platform odoo10 on debian follwing the odoo-development guidbook for installing a produktive system, the follwowing message is displayed after logging out

Traceback (most recent call last):
  File "/home/odoo/odoo-10.0/odoo/http.py", line 640, in _handle_exception
    return super(JsonRequest, self)._handle_exception(exception)
  File "/home/odoo/odoo-10.0/odoo/addons/base/ir/ir_http.py", line 184, in _dispatch
    auth_method = cls._authenticate(func.routing["auth"])
  File "/home/odoo/odoo-10.0/odoo/addons/base/ir/ir_http.py", line 112, in _authenticate
    getattr(cls, "_auth_method_%s" % auth_method)()
  File "/home/odoo/odoo-10.0/odoo/addons/base/ir/ir_http.py", line 85, in _auth_method_user
    raise http.SessionExpiredException("Session expired")
SessionExpiredException: Session expired

https is eabled, using nginx....

odoo-access.log and odoo-error.log of nginx does not show any clue