socket.setKeepAlive(true) can send massive [TCP Keep-Alive] messages

[betimer]

• Version: 8.9.1 (But it also happens on 10.14.0)
• Platform: Windows Server
• Subsystem: 2012 R2

socket.setKeepAlive(true, 3000) works fine, which will create tcp connection every 3 seconds

The issue is socket.setKeepAlive(true), if do not put delay millisecond parameter (which is default 0), it, however sends 290 keep alive message in every second.

Another finding is that, the default massive keep alive message does not happen on my personal laptop (So it only happens on production server)

[apapirovski]

@betimer you're setting the delay to 0 so it'll just send it as often as it can — this works as expected. I'm going to close this out as I don't really see anything that we can do to change this. As far as I can see this is even documented.

[betimer]

Hi @apapirovski
I can see 2 different behaviour on Window Server 2012 and my personal Win 10.

On Window Server 2012, it sends averagely 290 keep alive messages (I can check from wireshark)

But on my personal PC, I cannot see it sending the keep alive message.

So I believe there is localize logic to execute in node based on different local OS environment