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The system type (parameter wdisp/system_<xx>) determines how Web Dispatcher works. Only with system types SILOC and EXTSRV Web Dispatcher will not try to query the message server, otherwise it will. Currently your Web Dispatcher is unable to query the message server. If this is intended behaviour, you will have to setup one or more systems of type SILOC or EXTSRV. Otherwise Web Dispatcher has nothing to do, it has no destinations where to dispatch requests.