IPF and multicast
If you are using a tight host-based firewall and want the host to participate in multicast traffic, you may need to allow IGMP traffic as well as the actual multicast UDP packets.
In IPF terms, adding a rule set like
# IGMP is a separate protocol and there is no igmp keyword for my version of ipf
# so had to look up the decimal number in /etc/protocols
pass in quick proto 2 from any to any
pass out quick proto 2 from any to any
should do the trick.
If you are using weblogic app server in clusters you will need to do this.
Tip of the hat to Joe Wilcoxson.