F21 SSH sends TCP keep-alive - server RSTs

[Robert Moskowitz]

For some reason, after LOTS of idle chatter between my F21 SSH client 
and the server (I am assuming these are SSH application keep-alives), my 
F21 SSH client sends a TCP keep-alive.  This is after some long time of 
the client NOT sending an SSH idle packet.

As soon as the server receives this TCP keep-alive, it sends a TCP RST 
and that 'breaks the pipe'.

So what in the client determines the rate of SSH keep-alives and for how 
long inactive?

Then with the app level inactive, why the TCP keep-alive?

Or do I take this question to the OpenSSH list?