More than 1013 Connections using QTCPSocket!!

[Alux]

hi eyerybody. i'm trying to Write client & server using qtcpsocket in server side. the client is able to write over and over on socket connection, and the server is work fine before 1000 connections, but the server dose not handle more than 1013 connections.
note :

• im using server on linux.
• i get no error on server side.
• the CPU Usage get to 100% instantly between around 1000 connection open socket and 1013.
  thanks All.