Challenge identifying mainframe port

Hi Dev,

I’m testing a mainframe and this looks like it should be triggering the tn3270 service detection but doesn’t work. I worked previously (sorry I can’t get more specific than ‘previously’). Any suggestions on what I could change to make this work?

> PORT     STATE SERVICE VERSION
> 223/tcp open  telnet
> 1 service unrecognized despite returning data. If you know the service/version, please submit the following fingerprint at https://nmap.org/cgi-bin/submit.cgi?new-service <https://nmap.org/cgi-bin/submit.cgi?new-service> :
> SF-Port223-TCP:V=7.60SVN%I=7%D=10/18%Time=59E78CD2%P=x86_64-unknown-linux
> SF:-gnu%r(tn3270,12,"\xff\xfd\.\xff\xfd\x18\xff\xfe\x19\xff\xfc\x19\xff\xf
> SF:e\0\xff\xfc\0");
>

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