Socket SO KEEPALIVE
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External
Internal
Overview
Tells whether the TCP Keep-Alive mechanism is turned on for a socket. TCP Keep-Alive works as described here:
The value of the configuration flag can be obtained from the Socket or from the SocketChannel with supportedOptions().
All we can do on a Java socket is to turn TCP KeepAlive on or off - apparently on a per-socket based:
void setKeepAlive(boolean); boolean getKeepAlive();
The KeepAlive parameters can be only set at the operating system level.