IPad guest users cannot see YouTube videos but Android devices can

Hi all,
I am in the process of moving a guest SSID from a local Wireless LAN Controller to it being anchored for security reasons to another WLC in the DMZ. I have created a test SSID which is anchored in the DMZ and have found that everything is working perfectly except for YouTube videos. While those guest users that are connected on Android devices can watch YouTube videos just fine, those connecting via iPads or iPhones are unable to watch these videos. Any ideas?
Thank you in advance for your help.
rgrds,
inayat

Hi George,
Thank you for your reply.
I did two packet captures: once with a working Android device and once with a failing iPad. There did not seem to be any difference in packet sizes when trying to download a YouTube video (both seemed to be around 1368 bytes per packet). The packet capture with the failing iPad showed a number of TCP resets and attempts to connect to 224.0.0.251 MDNS) - that seemed to be the only difference with the packet capture from the working Android device.
What I did notice when looking at the existing local WLC (from where the iPads can successfully connect to YouTube - remember that they are failing when they are tunnelled to a test SSID in the DMZ) the local WLC contained a Layer 3 MGID for 224.0.0.251 with a number of users in that group which were iPad users. When I looked at the anchor WLC in the DMZ it did not have this MGID listed - or any other Layer 3 MGID for that matter.
Your comments and ideas please!
rgrds,
inayat

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