Doubling tcp resets

@jazzl0ver wrote:

Hi,

While researching an issue, I’ve found out doubling tcp resets:

# tcpdump -nn "host 172.30.2.194 and port 3443" | grep "[R]"
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
16:53:27.454475 IP 172.30.2.194.3443 > 172.30.1.30.10434: Flags [R], seq 4150895860, win 0, length 0
16:53:27.454628 IP 172.30.2.194.3443 > 172.30.1.30.10434: Flags [R], seq 4150895860, win 0, length 0
16:53:28.540711 IP 172.30.2.194.3443 > 172.30.1.30.10578: Flags [R], seq 4211144735, win 0, length 0
16:53:28.540730 IP 172.30.2.194.3443 > 172.30.1.30.10578: Flags [R], seq 4211144735, win 0, length 0
16:53:30.741290 IP 172.30.2.194.3443 > 172.30.2.55.34986: Flags [R], seq 4066360692, win 0, length 0
16:53:30.741376 IP 172.30.2.194.3443 > 172.30.2.55.34986: Flags [R], seq 4066360692, win 0, length 0
16:53:36.051007 IP 172.30.2.194.3443 > 172.30.1.30.8370: Flags [R], seq 3608015152, win 0, length 0
16:53:36.051020 IP 172.30.2.194.3443 > 172.30.1.30.8370: Flags [R], seq 3608015152, win 0, length 0
16:53:45.898741 IP 172.30.2.194.3443 > 172.30.2.55.35228: Flags [R], seq 3409875850, win 0, length 0
16:53:45.898780 IP 172.30.2.194.3443 > 172.30.2.55.35228: Flags [R], seq 3409875850, win 0, length 0
16:53:46.603130 IP 172.30.2.194.3443 > 172.30.2.55.34398: Flags [R], seq 1417708259, win 0, length 0
16:53:46.603242 IP 172.30.2.194.3443 > 172.30.2.55.34398: Flags [R], seq 1417708259, win 0, length 0

Can anyone explain them?

PS HAProxy v.1.9.5 running under Amazon Linux on AWS EC2 instance
PPS There’re two EC2 instances and both of them send tcp reset twice.

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