LAN and Wireless Not communicate

Dear support,
I do have a Cisco router and Juniper firewall, which allow me to connect to internet.
Internally after the firewall, i connect it to switches and wireless AP.
Both switch and wireless AP must be able to talk to each other, when user pc connect to LAN via switch or wifi via wireless AP
My switch is Cisco 2960, and AP is AP1142N.
I do have application, IPhone which install an app, call media remote, this features enable me to remote control to my music device
IPhone connect using wifi
Music device connect using switch
Cisco router ------ Juniper firewall ------ Catalyst 2960 ----------- AP1142N . . . . IPhone
                                                                       |
                                                                       |
                                                                       |
                                                                 Music device
If in above scenario, my Iphone not able to detect music device
Cisco router ------ Juniper firewall ------ Catalyst 2960 ---------Hub ----------- AP1142N . . . . IPhone
                                                                                                     |
                                                                                                     |
                                                                                                     |
                                                                                               Music device
I don't understand why if i using any brand hub, example 3com, belkin, buffalo, etc, which use only as hub, just connect to my cisco switch, and both music device and AP1142N, are able to talk (iphone able to search my music device)
If i replace the hub, as cisco switch, and use it as default setting, it not able to detect
The connection to hub, i am using access port, as we only have one vlan.
My configuration as below for my switch and wireless ap
I wonder why only normal hub able this two device to communicate, but cisco not.
Thanks

Thank a lot.
i already enable the igmp on switch
when i show igmp snooping at switch
Vlan4:
IGMP snooping                         : Enabled
IGMPv2 immediate leave          : Disabled
Multicast router learning mode: pim-dvmrp
CGMP interoperability mode    : IGMP-ONLY
Robustness variable              :2
Last member query about      :2
Last member query internal   : 1000
Both vlan 1 and vlan 4 is the same
I already try enable igmp on firewall side as well, juniperSSG140
but still not work, anyone can help?

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