Next should be a SYN/ACK packet with its own SEQ number and an ACK value of 246811967.Д«ut it's sending an ACK with SEQ=1736793629 and ACK=172352206. The 'set anti-replay loose' command on fortinet can allow this ACK packet to be forwarded instead of dropped. In Jeff case, he said in a comment he use a Fortinet firewall, these firewall (by default) will drop the ACK related to the old session (because the firewall see no open session related to the ACK), so the client doesn't send any RST and the server can't clear the session from TIME_WAIT state (except of course at the end of the TIME_WAIT timer). So the normal behavior is that the connection should work but be delayed by a second (till the secondary SYN is sent). In the meantime the RST has been send and the session cleared on the server, so this secondary SYN will work and the server will reply SYN/ACK and so on.

On his side, the client is waiting for a SYN/ACK, as it don't get it, it will send a new SYN. When the server receive this RST it will immediately clear the socket (so it's no longer in TIME_WAIT). so the kernel will send a ACK related to the old session, then ? The client OS should receive the ACK (of the previous session), don't understand it because for the client the session is closed, send a RST. To many in the public arena, the use of synthetic or manufactured chemicals on crops presents a frightening image of immediate and long term health problems. if the SEQ number of the SYN is than the SEQ number of a previous one.Д®ach OS use different algorithms that are more or less safe to avoid this particular issue One of the most publicized and controversial issues in crop production is the use of agrichemicals.if the SEQ number of the SYN is > than the SEQ number of the previous packet, a new connection is crated and everything works.

The capture would have to show the old session also to be able to compare SEQ numbers) (PS: in the image of the wireshark output attached to this issue, seq number are shown as relative, if you don't set them as absolute you can't see the issue. On Linux when a socket is on TIME_WAIT and a new SYN append (for the same pair of ip/port src, ip/port dest), the kernel check if the SEQ number of the SYN is than the last SEQ received for this socket. After having the same issue I finally catch the root cause.

Explain syn