I keep getting the following alarm from my wife's MacBook Air.
UDP Port 5353 on device CG-LB is open to public permanently for PCP MAP 7f54ece3581abc53007142ee.
I can't figure out what is opening this port. Sometimes the port is open for a short period of time. The PCP MAP changes frequently if not every time. I notice that port 4500 is sometimes used instead.
- Anyone know what is likely to be causing this?
- What kind of rule can I write to block it?
None of the other devices on my network trigger this alert.
Also, Yesterday I created a rule that blocks Device UDP Port 5353 for this MacBook always but I am still seeing the alerts.
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