I´m researching on UPnP communication and I found that it relies on multicast 
messages sent to address on port 1900

I tried to receive messages from this multicast address using ICS but it does 
not work. Using other multicast addresses it works just fine, but I simply 
can´t receive messages from multicast address Neither 
using Indy..

I can send messages to this address, and all UPnP devices answers to my request 
(I saw by sniffer), but I can´t receive it in my software.

Do you know if there is any limitation on the under windows sockets layer?

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