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I've already written an answer to another question that details all the reasons a fingerprint may be non-ideal, but the short answer is yes, Nmap requires a closed TCP port to get the best match. But I'd guess that there are other things interfering with your scan if it's showing Nginx running on Windows CE. Based on your output, I'd guess that the first ...


Below is my response, i pressume you're not scanning out of malicious intent and your question is thus legit. I hold no responsibility for whatever you deduce or what actions may follow based on this post. In short, no. NMap relies on typical timing, sequences and other identifiers to perform OS fingerprinting. It i also easily thwarted by the in-between ...

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