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Asked: 2026-06-10T08:23:48+00:00

I have two erlang nodes running in two different computers, in one node I

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I have two erlang nodes running in two different computers, in one node I have an ssl client and in the other i have the ssl server. Both computers are connected to the Internet via wifi connection.

Everything works right, but I wonder why if I switch off the wifi in the client laptop I don’t receive the {ssl_closed, Socket} message.

Socket options are:

{active, true}, {keepalive, true}

I mean, the socket should not be valid anymore..right?

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1 Answer

  1. Editorial Team

    The global TCP keepalive timeout value is typically set to a value like 7200 seconds between the keepalive messages. If you are on a Linux system you can check it with sysctl -a | grep keepalive.

    Fiddling with this value is not really recommended since it is a global configuration. Instead you should add a ping message to your application level protocol (letting the client send pings now and then), the server can simply discard it.

    It seems to be possible to set per-socket keepalive timeouts through the inet:setopts/2 function and using the rawoption, but I don’t know if that is recommended (it’s not portable between platforms)

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