Through the sample code to demonstrate if you are using windows API set TCP/IP heartbeat packets using TCP/IP protocol KeepAlive feature built-in disconnect to connect isolated.

Packet : 59564370tcpkeepalive.rar filelist
TCPKeepAlive测试\gTCPKeepAlive.bdsgroup
TCPKeepAlive测试\gTCPKeepAlive.bdsgroup.local
TCPKeepAlive测试\gTCPKeepAlive.dsk
TCPKeepAlive测试\gTCPKeepAlive.~dsk
TCPKeepAlive测试\pClient.bdsproj
TCPKeepAlive测试\pClient.bdsproj.local
TCPKeepAlive测试\pClient.cfg
TCPKeepAlive测试\pClient.dpr
TCPKeepAlive测试\pClient.exe
TCPKeepAlive测试\pClient.res
TCPKeepAlive测试\pServer.bdsproj
TCPKeepAlive测试\pServer.bdsproj.local
TCPKeepAlive测试\pServer.cfg
TCPKeepAlive测试\pServer.dpr
TCPKeepAlive测试\pServer.exe
TCPKeepAlive测试\pServer.res
TCPKeepAlive测试\uClient.dcu
TCPKeepAlive测试\uClient.dfm
TCPKeepAlive测试\uClient.pas
TCPKeepAlive测试\uServer.dcu
TCPKeepAlive测试\uServer.dfm
TCPKeepAlive测试\uServer.pas
TCPKeepAlive测试\__history\gTCPKeepAlive.bdsgroup.~1~
TCPKeepAlive测试\__history\uClient.pas.~1~
TCPKeepAlive测试\__history\uClient.pas.~2~
TCPKeepAlive测试\__history\uServer.dfm.~1~
TCPKeepAlive测试\__history\uServer.dfm.~2~
TCPKeepAlive测试\__history\uServer.dfm.~3~
TCPKeepAlive测试\__history\uServer.dfm.~4~
TCPKeepAlive测试\__history\uServer.dfm.~5~
TCPKeepAlive测试\__history\uServer.dfm.~6~
TCPKeepAlive测试\__history\uServer.dfm.~7~
TCPKeepAlive测试\__history\uServer.dfm.~8~
TCPKeepAlive测试\__history\uServer.pas.~30~
TCPKeepAlive测试\__history\uServer.pas.~31~
TCPKeepAlive测试\__history\uServer.pas.~32~
TCPKeepAlive测试\__history\uServer.pas.~33~
TCPKeepAlive测试\__history\uServer.pas.~34~
TCPKeepAlive测试\__history\uServer.pas.~35~
TCPKeepAlive测试\__history\uServer.pas.~36~
TCPKeepAlive测试\__history\uServer.pas.~37~
TCPKeepAlive测试\__history\uServer.pas.~38~
TCPKeepAlive测试\__history\uServer.pas.~39~
TCPKeepAlive测试\__history
TCPKeepAlive测试

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