The LocalEndPoint property gets an EndPoint that contains the local IP address and port number to which your Socket is bound. You must cast this EndPoint to . - 0 as the constructor parameter set the app to automati.y find free udp port. IPEndPoint udpClient.Client.LocalEndPoint .Port.ToString is .Subject changed from UDP Multicast face may need additional identification to Identify local endpoint of multicast face; Description updated diff ; Start date .Endpoint already allocated for a different UDP multicast face" ;. } // check if the local endpoint is already used by a unicast channel. if m_channels.find localEp .