tcp reset with and without ack flag set

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Hi,

Is there any difference between a RST packet with and without ACK bit set? The reason I asked this is because I am handling an issue that when an RST with ACK bit set, it will be dropped somewhere since I don't see it on the destination capture, while an RST without ACK bit set was able to reach the destination.

My understanding is that every single packet after the SYN packet should have ACK bit set. Wondering which behavior is compliant and under what kind of situation an ACK bit would and would not be set.

Appreciate any insights!