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I have Fink installed on my MacBook Air and when I looked for open ports I see the following which I am unfamiliar with:

8080 common http-proxy/second web server port.

8081 blackice-icecap ICECap user console.

What are these and should I be concerned with them?

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The "blackice-icecap user console" is a piece of administration software for a firewall system. However, it is very unlikely that you have that system running on your MacBook Air.

In essence your port list just writes the name of the software that has registered the port with IANA - i.e. they're saying that "our software uses this port". However, other software can also use the port number - and this is what happened for you.

You can run the following commands in the Terminal to find out, which program has opened the ports:

lsof -n -i4TCP:8080
lsof -n -i4TCP:8081

You'll find both the command name and the process ID (PID) of the program that opened the ports.

Whether or not you should be concerned about it depends on what that program is. If it is something you installed yourself, is aware of, and you're using - then that's OK. If it is something that is running without your knowledge, or you're no longer using, you will probably want to look further into it.

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  • This is what came up with those prompts:
    – mcbcin
    Jun 11, 2020 at 14:35
  • Did you forget to include something?
    – jksoegaard
    Jun 11, 2020 at 15:47
  • % lsof -n -ipTCP:8081 lsof: unknown protocol name (pTCP) in: -i pTCP:8081 lsof 4.91 latest revision: lsof.itap.purdue.edu/pub/tools/unix/lsof latest FAQ: lsof.itap.purdue.edu/pub/tools/unix/lsof/FAQ latest man page: lsof.itap.purdue.edu/pub/tools/unix/lsof/lsof_man usage: [-?abhlnNoOPRtUvVX] [+|-c c] [+|-d s] [+D D] [+|-f[cgG]] [-F [f]] [-g [s]] [-i [i]] [+|-L [l]] [+|-M] [-o [o]] [-p s] [+|-r [t]] [-s [p:s]] [-S [t]] [-T [t]] [-u s] [+|-w] [-x [fl]] [--] [names] Use the ``-h'' option to get more help information.
    – mcbcin
    Jun 11, 2020 at 15:55
  • I just don't know what this is and how to get rid of it if it shouldn't be there.
    – mcbcin
    Jun 11, 2020 at 15:57
  • You had a typo when you entered the command - you wrote "p" instead of "4". I suggest using cut-n-paste to ensure it is the correct command.
    – jksoegaard
    Jun 11, 2020 at 17:22

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