Server.app and port 4444

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Level 1

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Server.app and port 4444

I was checking my open ports on my Mac server recently and noticed that port 4444 was open. I don't (to my knowledge) have any services installed that use this port so I was a bit confused. Whatever is using this port is being run under launchd so I cant kill it directly. When connecting to this port over telnet it returned an HTTP 405 error. As a test, I uninstalled Server.app temporarily and when I checked my ports again it was no longer open. What does Server.app use this port for?

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Mac mini (Late 2012), OS X El Capitan (10.11.5)

Posted on Jun 23, 2016 7:26 PM

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Answer 1

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Strontium90

Level 5

5,055 points

Sep 16, 2016 10:39 AM in response to hiiamaperson

This port should only be accessible from the server itself over localhost. This is the krb524 (Kerberos 5 to 4 translator) process and is used with Directory Services. With Server.app installed and services running, this is a normal service. but as mentioned, it should only respond when queried via localhost. If you do a port scan or telnet from another machine on your LAN, the service should not respond.

Reid

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