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I'm trying to receive UDP packets which are sent to a multicast group. I can see the packets being received in WireShark (dest ip = 220.127.116.11 dest port = 1120), and can receive the data using an example python script I found on the net, meaning that UDP multicast group and port are correct. I'm creating an UDP server like this: var UDPServer: TWSocketServer; begin UDPServer := TWSocketServer.Create(Self); UDPServer.Proto := 'udp'; UDPServer.Addr := '0.0.0.0'; UDPServer.Port := '1120'; UDPServer.MultiCast := true; UDPServer.ReuseAddr := true; UDPServer.MultiCastAddrStr := '18.104.22.168'; UDPServer.OnDataAvailable := OnUDPDataAvailable; UDPServer.Listen(); end; The OnUDPDataAvailable is never called, am I missing something here in setting the server up properly to listen for this group?