The multicast traffic should be able to pass if the servers are in the same vlan. If they are not in the same vlan, then it would have to pass through the firewall. In order to pass this traffic through the firewall, you would need a regular policy permitting it. Multicast policies are only used for multicast control messages (join/prune, etc). Another thing to watch for is IGMP snooping on the switches. You may have to turn that off.
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