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Distribution middleware is often integrated as a COTS, providing distribution facilities for critical, embedded or large-scale applications. So far, typical middleware does not come with a complete analysis of their behavioral properties. In this paper, we present our work on middleware modeling and the verification of its behavioral properties; the study is applied to our middleware architecture: PolyORB. Then we present the tools and techniques deployed to actually verify the behavioral properties of our model: Petri nets, temporal logic and advanced algorithms to reduce the size of the state space. Finally, we detail some properties we verify and assess our methodology.