What are these ports 989, 1021, 1033 and why are they always ON?
I have noticed unknown network traffic on Activity Monitor, even I close all application, AM still shows there's about 1~2 KB (Data received).
So, I open a Terminal and check by 'netstat' command. I notice there's some unknown tcp connections established. Is there anyone know what are these ports, and is it normal to have them ON all the time ?
$ netstat -n | grep EST
(..omited)
tcp4 0 0 127.0.0.1.1033 127.0.0.1.989 ESTABLISHED
tcp4 0 0 127.0.0.1.989 127.0.0.1.1033 ESTABLISHED
tcp4 0 0 127.0.0.1.1033 127.0.0.1.1021 ESTABLISHED
tcp4 0 0 127.0.0.1.1021 127.0.0.1.1033 ESTABLISHED
These ports are some of those used by the NetInfo subsystem which keeps track of your computer's users, groups, and some other information about its configuration. Since the IP addresses listed for those connections are all 127.0.0.1, your computer is connecting to itself; having these open isn't a cause for concern.
(16141)
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<blockquote>
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</blockquote>
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