We analyze the kinetic theory for dense gases proposed by Bogolyubov. We arrive at the conclusion that the boundary conditions proposed by him are not adequate for the description of a dense gas. This fact is the reason for the occurrence of the divergences found in the virial expansion of the generalized Boltzmann equation and of the transport coefficients. We propose new boundary conditions which lead to convergent virial expansions of the kinetic equation and of the transport coefficients.