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So your box is connected to your router via powerline adapters? do the extra channels work with the box connected directly to the modem? Is it a BT box or a TalkTalk box?
connect a laptop directly to the the hub (not to one of the extenders) either by wifi or cable, launch VLC media player, Click Media on the menu bar, select Open Network Stream from the drop-down menu and enter rtp://126.96.36.199:5802 and see if the test stream works. If it does then the problem is somewhere in your home, otherwise it could be the hub or your broadband. I'm assuming your extra channels have worked OK up till now?
Yes, it's correct. If you connected directly to your hub as I said to do then you should have seen the test stream.
First of all check the firewall on the PC or laptaop you tried to connect with, make sure VLC Media Player is added as an exception for both private and public networks.
If it still doesn't work then the problem could be down to your router or broadband, What hub are you using? Have the extra channels worked at all since you moved to BT?
The test stream should work fine on wifi as long as you have a decent signal and you are connected to the hub itself, if you're connected to an extender then that could introduce other factors.
The main purpose of this test was to confirm that the multicast packets are present, your PC proves that they are.
To the best of my knowledge, you don't have to have a Youview subscription to be able to view the test stream on a PC, so I would say that the problem is with either your home network or your subscription.