The invention relates to a system for managing of communication between at least one client (10a-d) and at least one server (12a-d) with a primary broker (20) which comprises a first volatile memory (23) and which manages at least one request of the at least one client (10a-d) at the at least one server (12a-d). The system further comprises a backup broker (30) with a second volatile memory (33) which manages at least one request of the client (10a-d) at the server (12a-d), when the primary broker (20) has failed, wherein the primary broker (20) comprises a journal with entries on actions which may change the state of the first volatile memory (23) and sends these entries of the journal to the backup broker (30) such that the state of the second volatile memory (33) is essentially identical to the state of the first volatile memory (23).