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TV box saying no signal on channel when put behind firewall/router

Level 2
1 of 8

I got a unifi Dream Machine (awesome router) and all devices now works through that and all is great EXCEPT the tv box.


It keeps saying there are no signal on the channels - it only starts working when I route it directly through the ADSL router - I assume there are some ports or other setup that needs opening up in the router or something.


Anyone know what they are ? 

Community Manager
2 of 8

Hello @maxandersen 


Thank you for your contribution. 🙂


I asked an expert, but unfortunately we can't help you out. Maybe @Tux0ne can?


Best regards

Swisscom Mitarbeiter im Bereich Social Media & Community Management.
Employé Swisscom dans le domaine Social Media & Community Management.
Swisscom employee in the field of Social Media & Community Management.
Level 2
3 of 8

Since I posted I figured out it is only the live TV that there are issues with - I can switch to "watch from beginning" and it streams just fine.


so i'm curious to know what "magic" the swisscom box does that isn't happening when traffic is sent via a router. 

Super User
4 of 8

The magic is called multicast. You need an igmp proxy:

long story short (tl;dr)

The udm currently doesn‘t have an igmp proxy on board...
Falls du in deinem Thread eine Antwort von Tux0ne wünschst, so ergänze deinen Text mit @Tux0ne. Damit erhalte ich eine Benachrichtigung.

Level 2
5 of 8

dammit ;/ 


so no way around that ? are there switches with igmp proxy on them or do i really need to add another router ? 

Level 2
6 of 8

can swisscoms adsl boxes not do a direct pass through or would putting the router in DMZ be enough ? 

Level 2
7 of 8


you don't need another router, it's just a configuration you need to do on your dream machine.

Level 2
8 of 8

but the dream machine doen't support the multicast proxy so i need to look for alternatives.


for now my alternative is to just use zattoo and which I might just stay with and save the 50 chf per month 🙂

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