Why is Socket.BeginReceive losing packets from UDP?

UDP can drop packets whenever it likes. In this case you could try setting a much larger socket receive buffer at the receiver to mitigate.

As said above, UDP is not a reliable protocol. It's a connectionless protocol which puts much less overhead on IP packets, than TCP does. UDP is quite good for many functions (including broadcast and multicast messages) but it can't be used for reliable message delivery.

If the buffer is overloaded, network driver will just drop datagrams. If you need message-based communication with reliable delivery or you expect many messages to be sent, you can check our MsgConnect product (free open-source version available), which provides message-based data transfer over sockets as well as over UDP.

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