  We study by Montecarlo simulation the non-equilibrium stationary behavior of
a three-dimensional stochastic lattice gas with reversible kinetic constraints
and in diffusive contact with two particle reservoirs at different chemical
potential. When one of the boundaries is placed in the glassy phase, the
statistics of entropy production fluctuations driven by the chemical potential
gradient satisfy the Gallavotti-Cohen fluctuation theorem provided that an
effective entropy production is introduced.
