permissions

From	<nourdebian2016@tutanota.com>
Newsgroups	linux.debian.project
Subject	permissions
Date	2019-06-05 14:00 +0200
Message-ID	<y5CKd-4UV-3@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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Hi
We thank you very much for your efforts and great achievements.
I have a problem I want to solve.
I have created another group and want to prevent it from connecting to the whole machine except for one program either through the firewall or through the permissions.

I tried using chmod and removed the execute from the others but the result was as if I removed the execution from the user who is me.
What is the solution ?
Is there a firewall solution at the software level? what is it  ?
Is there a solution using permissions?
Thank you

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permissions <nourdebian2016@tutanota.com> - 2019-06-05 14:00 +0200
  Re: permissions Roberto C. Sánchez <roberto@debian.org> - 2019-06-05 14:20 +0200
    Re: permissions Ian Jackson <ijackson@chiark.greenend.org.uk> - 2019-06-05 15:40 +0200
      Re: permissions Roberto C. Sánchez <roberto@debian.org> - 2019-06-05 16:00 +0200
        Re: permissions Semih Özlem <semozl@gmail.com> - 2019-06-05 17:00 +0200
          Re: permissions Omer Ozarslan <omerfaruko@gmail.com> - 2019-06-06 21:10 +0200

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