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Keep-alive Enabled |
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Since the present version you can enable a server side check on the user's reachability! |
To be reachable the client must set up a stable socket to the server. Each client sends a "keep alive" request to the server it's connected to in order to keep up the socket. This is necessary as the TCP socket has an idle timeout after which the socket is closed. Some aggressive network devices can short the standard timeout under 10 minutes, making impossible for the client to send the "keep alive" request because it would always be late (the client sends its request every 10 minutes or so).
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