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[simoncn]

Some routers have difficulty with multicast on wireless network connections but work correctly with multicast on wired network connections.

With at least one router, the multicast problem occurs when usng the 5 GHz wireless band but does not occur when using the 2.4 GHz wireless band. If you are curently using the 5 GHz band, you could try changing to 2.4 GHz to see if this makes a difference.