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Port 55555 in use on Mac OS Big Sur
I've noticed the port 55555 looks like it is already in use on Mac OS Big Sur. If you run nc -l 55555 it shows an error. "Address already in use" But nothing answers if you telnet it, and nothing shows up on lsof -i tcp:55555 too. Very odd behaviour. Confirmed on several different machines.
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Jan ’21