For gen5/6 sonicwall devices that are handling multicasting, they will have to enable IP Helper/MDNS entries for multicast to work.

In addition to Multicast, some network devices may require port forwarding configured. An example is the 

Sonicwall NSA240.

SonicWall TZ210

It may be necessary to allow specific ports or the multicast packets will drop under various scenarios.

Allow FIREWALL PORTS:                  

TCP 4321 Presto

TCP 9631 PrintKit - IPP

UDP 5353 Bonjour

TCP/UDP 53  DNS Port

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