NGINX Reverse Proxy terminate TCP connection after 5 minutes of inactivity

[J Carter]

Hello,

On Mon, 19 Feb 2024 16:24:48 +0800
Kin Seng <ckinseng at gmail.com> wrote:

[...]
> Please refer to the attachments for reference.
> 
> On Mon, Feb 19, 2024 at 4:24 PM Kin Seng <ckinseng at gmail.com> wrote:
> > After capturing the tcp packet and check via wireshark, I found out that
> > the nginx is sending out the RST to the public server and then send FIN/ACK
> > (refer attached pcap picture) to client application.
> >
> > I have tried to enable keepalive related parameters as per the nginx
> > config above and also check on the OS's TCP tunable and i could not find
> > any related settings which make NGINX to kill the TCP connection.
> >
> > Anyone encountering the same issues?
> >

The screenshot shows only 1 segment with FIN flag set too which is
odd - there should be one from each party in close sequence. Also the
client only returns an ACK, rather than FIN+ACK, which it should if
nginx was the initiator of closing the connection...