How can i bypass the firewal/ids/ips to get port 50000 tcp version?

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Im a cyber student and im doing CTF. Im working on my nmap skills and i got to a question that requiers me to find the version of tcpwrapped port that is secured by firewall/ids/ips. i tried using -sV and it didnt helped me.

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Bl3ss3d On

you should change for nc and change the source port. Some ports bypass by firewall