The present invention relates to a method for connecting a portable unit (1) to a particular server unit from among a plurality of server units (5, 6, 7 and 8). The portable unit (1) comprises a first address list and the particular server unit comprises a second address list. The first and the second address lists comprise the attribute of at least one server unit and the address of this server unit. The method comprises the steps of updating the second address list from the first address list and updating the first address list from the second address list. The invention also relates to a server unit and a portable unit.