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Next.js not detecting that port 3000 is taken

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Thrianta posted this in #help-forum
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ThriantaOP
Hey again everyone, I'm currently trying to run several next.js apps at once and they for some reason seem to have stopped detecting that one of them has taken port 3000 already? I'm aware that I can just change the dev port however... Is this a bug?... because it always took other ports instead.

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Giant panda
you may have another project running on 3000 on a browser window tucked away somewhere, the only way it wouldn't be available is if its already in use on your machine
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that's strange, by right the OS should reject the attempt to retake the port
so even if nextjs wanted to take 3000 again, it shouldn't be able to – if not that's a pretty serious OS bug