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When a filter is 'green', it means that there is no syntax error in the filter itself. The result can still be empty.

Only if you filter for something that is actually present in the capture, the list won't be 'blank'.

TCP SYN bit set to 1: tcp.flags.syn==1

frame matches"(?!)set-cookie": did you mean contains? "(?!)" = Negative Lookahead, why?