F5 LTM sending reset packets to Pool member
F5 LTM has a pool member listening on port 8003 and its mainframe server. Pool member is UP but Mainframe console shows consistently F5 is rejecting the connection ( No issues in accessing the VIP ). So I checked the TCpdump and I see F5 is resetting the connection after 3 way handshake . Can someone check and let me know why. its not health check because I configured healthcheck as ICMP.
10:01:14.987346 IP 172.31.x.x.18925 > server91.test.com.8003: S 3137956918:3137956918(0) win 5840 10:01:14.987651 IP server91.test.com.8003 > 172.31.x.x.18925: S 531369297:531369297(0) ack 3137956919 win 65535 10:01:14.987797 IP 172.31.x.x.18925 > server91.test.com.8003: . ack 1 win 46 10:01:14.995006 IP server91.test.com.8003 > 172.31.x.x.18925: P 1:28(27) ack 1 win 4096 10:01:14.995023 IP server91.test.com.8003 > 172.31.x.x.18925: P 28:42(14) ack 1 win 4096 10:01:14.995214 IP 172.31.x.x.18925 > server91.test.com.8003: . ack 28 win 46 10:01:14.995219 IP 172.31.x.x.18925 > server91.test.com.8003: . ack 42 win 46 10:01:15.004958 IP 172.31.x.x.18925 > server91.test.com.8003: R 1:1(0) ack 42 win 46