I've created a server using IOCP mechanism to handle a thousand of Clients Socket.

So i Stress the server with 2000 connection, i send data to the server every 1 second, length of packet is 2048 bytes, the server work just fine and when i close sockets on the client all sockets are closed on the server

When i stress the server using 2500 or more, Send and receive data work very well but when i close sockets on the client, i got only 2040 closed Sockets on the server and the iocp will never send the notification to close the rest of sockets

for more information i use AcceptEx to accept a new connection, the same issue with accept using Select Events methods

i'm using Zero Byte Read to avoid WSANOBUFS but same issue

i hope i found some one here with the same problem as me

i test the server on windows Seven 64 bit CPU : i7 4790K RAM : 16 GO

IDE : Visual C++ 2013

Language C++

i've disabled the Half TCP Connection on the registry

yes i'm very sure i got a notification for every new connection

for more information i use AcceptEx just to notifity me when there is a new connection and not to wait data (to avoid Denial of Service Attack)

i think it's my router can't handle more than 2100 connections because when i'm playing on localhost it's work just fine