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We reconsider the problem of the superconducting proximity effect in adiffusive ferromagnet bounded by tunneling interfaces, using spin-dependentboundary conditions. This introduces for each interface a phase-shiftingconductance Gphi which results from the spin dependence of the phase shiftsacquired by the electrons upon scattering on the interface. We show that Gphistrongly affects the density of states and supercurrents predicted forsuperconducting/ferromagnetic hybrid circuits. We show the relevance of thiseffect by identifying clear signatures of Gphi in the data of T. Kontos et al[Phys. Rev. Lett. 86, 304 (2001), ibid. 89, 137007 (2002)].Comment: submitted to Phys. Rev. Let

Superconducting proximity effect in a diffusive ferromagnet with spin-active interfaces