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As per this answer TCP keepalive can be enabled by three registry values. However, setting KeepAliveInterval=KeepAliveInterval=30000 miliseconds and TCPMaxDataRetransmissions=5 definitely does not result in any keepalive packets judging by Wireshark capture.

Should it work at all on Windows 10? Is there any other way to do that on OS TCP stack level? Is it configurable?

Pyotr Baykalov
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  • My Windows machine NICs stay on permanently (24x7 wired and wireless) What might you have done? – John Aug 25 '23 at 15:17
  • @John: I don't think the question is about NICs staying on? It's about _TCP connections_ periodically checking whether the other end of the connection is still on. – u1686_grawity Aug 25 '23 at 15:42
  • No issues here with TCP staying on all the time. – John Aug 25 '23 at 15:43
  • @John no issues if you own all the hardware between you and remote host and know how it is configured. That's rarely the case. – Pyotr Baykalov Aug 27 '23 at 13:29
  • Never an issue with remote connection either nearby or over VPN. – John Aug 27 '23 at 13:31

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