Run, don't walk to: http://www-306.ibm.com/software/integration/support/supportpacs/individual/m a86.html
and download the information about MQSeries and firewalls. HTH Dave Instructions for managing your mailing list subscription are provided in the Listserv General Users Guide available at http://www.lsoft.com Archive: http://vm.akh-wien.ac.at/MQSeries.archive