Please do not open multiple threads for the same issue. Let's stay on this one as the subject is (probably) more fit. No, you don't need to do anything to "reverse the communications flow", it is "built into TCP", it is full-duplex in its very own nature. Please post a capture file, descriptions are subjective. Your description sounds odd to me, seqnos are established at connection handshake. Do you know your port actually works ? Did you try a known good application from the contrib tree ? What API are you using ? NO_SYS = ?
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