Checking that the receiver has joined the required group
From the last hop router, FGT-3, you can use the following command to check that the receiver has correctly joined the required group.
FGT-3 # get router info multicast igmp groups
IGMP Connected Group Membership
Group Address Interface Uptime Expires Last Reporter
239.255.255.1 port3 00:31:15 00:04:02 10.167.0.62
Only 1 receiver is displayed for a particular group, this is the device that responded to the IGMP query request from the FGT-3. If a receiver is active the expire time should drop to approximately 2 minutes before being refreshed.