We're having problems with multicast between these machines: porta-video porta-display and this one: conf-wireless126-124.ncsa.uiuc.edu (141.142.126.124 ) with the following mcast addresses: 233.2.171.251 port 59986 233.2.171.251 port 59988 And we're relying on this for a demo at NCSA today. Please look into this and let us know status. Thanks, Tom