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Update sio-keepalive-vals.md #636

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Nov 19, 2020
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Update sio-keepalive-vals.md #636

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5 changes: 2 additions & 3 deletions desktop-src/WinSock/sio-keepalive-vals.md
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Expand Up @@ -165,9 +165,8 @@ To query whether TCP keep-alive is enabled on a socket, the getsockopt function
To enable or disable TCP keep-alive, the **setsockopt** function can be called with the [**SO_KEEPALIVE**](/windows/desktop/winsock/so-keepalive) option.
If TCP keep-alive is enabled with [**SO_KEEPALIVE**](/windows/desktop/winsock/so-keepalive), then the default TCP settings are used for keep-alive timeout and interval unless these values have been changed using **SIO\_KEEPALIVE\_VALS**.

The default settings when a TCP socket is initialized sets the keep-alive timeout to 2 hours and the keep-alive interval to 1 second.
The default system-wide value of the keep-alive timeout is controllable through the [**KeepAliveTime**](/previous-versions/windows/it-pro/windows-server-2003/cc782936(v=ws.10)) registry setting which takes a value in milliseconds.
The default system-wide value of the keep-alive interval is controllable through the [**KeepAliveInterval**](/previous-versions/windows/it-pro/windows-server-2003/cc758083(v=ws.10)) registry setting which takes a value in milliseconds.
The default system-wide value of the keep-alive timeout is controllable through the [**KeepAliveTime**](/previous-versions/windows/it-pro/windows-server-2003/cc782936(v=ws.10)) registry setting which takes a value in milliseconds. If the key is not set, the default keep-alive timeout is 2 hours.
The default system-wide value of the keep-alive interval is controllable through the [**KeepAliveInterval**](/previous-versions/windows/it-pro/windows-server-2003/cc758083(v=ws.10)) registry setting which takes a value in milliseconds. If the key is not set, the default keep-alive interval is 1 second.

On Windows Vista and later, the number of keep-alive probes (data retransmissions) is set to 10 and cannot be changed.

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