GFD-I.142 is published, and available online at http://www.ogf.org/gf/docs/ Title: Requirements on operating Grids in Firewalled Environments. Authors/editors: Thijs Metsch (Editor), German Aerospace Center Leon Gommans, University of Amsterdam Egon Grünter, Research Center Jülich Ralph Niederberger, Research Center Jülich Alan de Smet, University of Wisconsin Gian Luca Volpato, RRZN LUH Abstract: This document describes and evaluates approaches and solutions for firewall issues, such as application level gateways, host based firewalls, VPN style gateways etc., which are currently available to solve some of the problems Grid applications may face when dealing with firewalls located between the source and the destination of their communication paths. -- Greg Newby, OGF Editor