Socket connetion issue

Question

Hi,
I wrote multi thread socket programming.All clients are connected from different network switches.In case any one network switch go to down (power off) / unplug network cable between switches. In this case server program how to identify the connection status or how to know the whether client is connected or not.
Thanks in advance

Answer 1

Hmm, yes.
you can try thisYou can try this yourself, and you will find out that there are many circumstances in which it just sit there forever.
Please don't post misinformation or guesses in these forums.
You could try it with a read timeout, then you might have something, but then you don't know whether the peer is just slow at responding or the network is down.
The only way to detect a dropped TCP connection is to write to it.
Please also note that the methods Socket.isClosed(), Socket.isConnected(), etc, don't tell you about the state of the connection. They tell you about the state of the local Socket, i.e. they tell you which APIs you have called yourself on the socket.