Странно, потому что tcpdump показывает что RST отправляет именно балансер
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11:02:29.208274 IP lb1.cc1.46376 > 10.121.15.74.31001: Flags [S], seq 1825789029, win 29200, options [mss 1460,sackOK,TS val 4257877938 ecr 0,nop,wscale 9], length 0
11:02:29.208683 IP 10.121.15.74.31001 > lb1.cc1.46376: Flags [S.], seq 2625988586, ack 1825789030, win 27960, options [mss 1410,sackOK,TS val 1022466629 ecr 4257877938,nop,wscale 9], length 0
11:02:29.208696 IP lb1.cc1.46376 > 10.121.15.74.31001: Flags [.], ack 1, win 58, options [nop,nop,TS val 4257877939 ecr 1022466629], length 0
11:02:29.208713 IP lb1.cc1.46376 > 10.121.15.74.31001: Flags [P.], seq 1:50, ack 1, win 58, options [nop,nop,TS val 4257877939 ecr 1022466629], length 49
11:02:29.208904 IP lb1.cc1.46376 > 10.121.15.74.31001: Flags [P.], seq 50:309, ack 1, win 58, options [nop,nop,TS val 4257877939 ecr 1022466629], length 259
11:02:29.209045 IP 10.121.15.74.31001 > lb1.cc1.46376: Flags [.], ack 50, win 55, options [nop,nop,TS val 1022466630 ecr 4257877939], length 0
11:02:29.209183 IP 10.121.15.74.31001 > lb1.cc1.46376: Flags [.], ack 309, win 57, options [nop,nop,TS val 1022466630 ecr 4257877939], length 0
11:02:29.209639 IP 10.121.15.74.31001 > lb1.cc1.46376: Flags [.], seq 1:2797, ack 309, win 57, options [nop,nop,TS val 1022466630 ecr 4257877939], length 2796
11:02:29.209642 IP lb1.cc1.46376 > 10.121.15.74.31001: Flags [.], ack 2797, win 68, options [nop,nop,TS val 4257877940 ecr 1022466630], length 0
11:02:29.209720 IP 10.121.15.74.31001 > lb1.cc1.46376: Flags [.], seq 2797:6991, ack 309, win 57, options [nop,nop,TS val 1022466630 ecr 4257877939], length 4194
11:02:29.209731 IP lb1.cc1.46376 > 10.121.15.74.31001: Flags [.], ack 6991, win 85, options [nop,nop,TS val 4257877940 ecr 1022466630], length 0
11:02:29.209817 IP 10.121.15.74.31001 > lb1.cc1.46376: Flags [.], seq 6991:11185, ack 309, win 57, options [nop,nop,TS val 1022466630 ecr 4257877939], length 4194
11:02:29.209822 IP lb1.cc1.46376 > 10.121.15.74.31001: Flags [.], ack 11185, win 101, options [nop,nop,TS val 4257877940 ecr 1022466630], length 0
11:02:29.209915 IP 10.121.15.74.31001 > lb1.cc1.46376: Flags [.], seq 11185:12583, ack 309, win 57, options [nop,nop,TS val 1022466630 ecr 4257877939], length 1398
11:02:29.209920 IP lb1.cc1.46376 > 10.121.15.74.31001: Flags [.], ack 12583, win 107, options [nop,nop,TS val 4257877940 ecr 1022466630], length 0
11:02:29.209967 IP 10.121.15.74.31001 > lb1.cc1.46376: Flags [.], seq 12583:13981, ack 309, win 57, options [nop,nop,TS val 1022466630 ecr 4257877939], length 1398
11:02:29.209973 IP lb1.cc1.46376 > 10.121.15.74.31001: Flags [.], ack 13981, win 112, options [nop,nop,TS val 4257877940 ecr 1022466630], length 0
11:02:29.210103 IP 10.121.15.74.31001 > lb1.cc1.46376: Flags [.], seq 13981:20971, ack 309, win 57, options [nop,nop,TS val 1022466630 ecr 4257877940], length 6990
11:02:29.210110 IP lb1.cc1.46376 > 10.121.15.74.31001: Flags [.], ack 20971, win 140, options [nop,nop,TS val 4257877940 ecr 1022466630], length 0
11:02:29.210147 IP 10.121.15.74.31001 > lb1.cc1.46376: Flags [.], seq 20971:25165, ack 309, win 57, options [nop,nop,TS val 1022466630 ecr 4257877940], length 4194
11:02:29.210153 IP lb1.cc1.46376 > 10.121.15.74.31001: Flags [.], ack 25165, win 156, options [nop,nop,TS val 4257877940 ecr 1022466630], length 0
11:02:29.210184 IP 10.121.15.74.31001 > lb1.cc1.46376: Flags [P.], seq 25165:27961, ack 309, win 57, options [nop,nop,TS val 1022466630 ecr 4257877940], length 2796
11:02:29.210189 IP lb1.cc1.46376 > 10.121.15.74.31001: Flags [.], ack 27961, win 167, options [nop,nop,TS val 4257877940 ecr 1022466630], length 0
11:02:29.210211 IP 10.121.15.74.31001 > lb1.cc1.46376: Flags [.], seq 27961:36349, ack 309, win 57, options [nop,nop,TS val 1022466631 ecr 4257877940], length 8388
11:02:29.210216 IP lb1.cc1.46376 > 10.121.15.74.31001: Flags [.], ack 36349, win 200, options [nop,nop,TS val 4257877940 ecr 1022466631], length 0
11:02:29.210399 IP 10.121.15.74.31001 > lb1.cc1.46376: Flags [.], seq 36349:37747, ack 309, win 57, options [nop,nop,TS val 1022466631 ecr 4257877940], length 1398
11:02:29.210406 IP lb1.cc1.46376 > 10.121.15.74.31001: Flags [.], ack 37747, win 205, options [nop,nop,TS val 4257877940 ecr 1022466631], length 0
11:02:29.210431 IP 10.121.15.74.31001 > lb1.cc1.46376: Flags [.], seq 37747:48931, ack 309, win 57, options [nop,nop,TS val 1022466631 ecr 4257877940], length 11184
11:02:29.210436 IP lb1.cc1.46376 > 10.121.15.74.31001: Flags [.], ack 48931, win 249, options [nop,nop,TS val 4257877940 ecr 1022466631], length 0
11:02:29.210508 IP 10.121.15.74.31001 > lb1.cc1.46376: Flags [FP.], seq 48931:50629, ack 309, win 57, options [nop,nop,TS val 1022466631 ecr 4257877940], length 1698
11:02:29.210528 IP lb1.cc1.46376 > 10.121.15.74.31001: Flags [.], ack 50630, win 255, options [nop,nop,TS val 4257877940 ecr 1022466631], length 0
11:02:29.215540 IP lb1.cc1.46376 > 10.121.15.74.31001: Flags [R.], seq 309, ack 50630, win 255, options [nop,nop,TS val 4257877945 ecr 1022466631], length 0
