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c6678 network problem for number of client connection

I using ndk_2_21_02_43, NDK BSD Compatibility Layer.

I have 16 clients (PC) to connect to the server (DSP). Transmission and reception of network are working properly.

When the 17th client (or more clients) to connect to the server, only the receive function of server is working, and transmit function of server is failing.

However, the first 16 clients continues normal operation.

So, why only the receive function of the 17th client (or more) in server is working properly?