Firewall Safari Blocking all incoming connections, Unknown Administrators and Kerberos, System Configuration on my Personal MacBook Air M1.

All of those users are supposed to be there. There are over one hundred users on macOS. Administrators is a group, not a user, and is necessary.

The Application firewall does nothing useful for you. It only serves to block normal functions. Turn it off.

Shut the firewall off and see if it makes any difference.

l. See PRP_53's answer above about deleting User Accounts.

ll. Click on the up/down arrows and select "Allow Incoming connections" the click OK.

lll. Ignore those, they are macOS installed files that should not be deleted or modified.

Be Ultra Careful deleting an Administrator Account.

Delete a user or group on Mac

Especially as Apple Silicon Computers have a not to so well documented Ownership account with is directly related to Apple Silicon Computer

The " Owner Account of this computer "  has that privilege to add, remove, upgrade or downgrade accounts.

This would include adding more Admin Accounts and / or downgrading an ADDED Admin account 

Below link will provide additional insights about the Difference between Admin Accounts and Owner Accounts  

https://eclecticlight.co/2021/07/18/last-week-on-my-mac-the-perils-of-m1-ownership/

Omkar-Acharekar wrote:

I.

I have 2 users on my name but there is 3rd Unknown Administrator on my Mac Book Air M1. How to delete the 3rd Unknown Administrator.

That's a group name. You can have standard users and administrator users. The Administrators group is a handy way to set preferences for all administrator users.

Firewall has started to give the issue from today i.e. 11 October 2024 for Safari – Block all incoming connections. 

Turn off the firewall. I know the name sounds like it should be important or something, but it's not. It doesn't do anything except confuse people. That's why Apple ships it disabled.

I have Kerberos Plugins, System Configuration and Configuration Profile in Library folder – There are many folders inside and What is all this and Can someone throw light on it.

There are many folders and Plugins inside it.

The macOS operating system is the most complicated operating system ever made. It has hundreds of thousands of such files. You'll never find them all, even if you spent the rest of your life searching.

There's nothing wrong with your computer. You aren't being hacked.

To put the record right " Hi Apple Developer Supporters, "

These forums are User to User Forums and who volunteer our time

Apple themselves are not here either

If indeed you meant to post in the Apple Developers Forums >>

Apple Developer Forums

Omkar-Acharekar wrote:

Hi,

Thanks for your reply.

I raised the question of Administrators as previously (in month of April 2024) I couldn't edit, rename, add folder in my Documents as I didn't have Admin rights on my primary account. It was shocking as who did it on my personal MacBook and how ? Nobody has access to my personal MacBook except me.

Hence, I had to create new user on same MacBook.

Even after contacting Apple Customer Care (5 to 6 times) and screen sharing, they couldn't provide any solutions on how to become admin again on my primary account on MacBook Air.

It has been reported here that a macOS Upgrade stripped the admin capability from the only user. Often, people cause it to happen by incorrectly changing the short user name on the account. It is not impossible to recover admin capability, but it’s not trivial.

There was nothing like "Administrators" on my MacBook Air M1 which can be seen in the above snapshot.

Yes, there was.

Administrators is seen recently and it is causing sudden problem as the above case (primary account).

No, it isn’t.

Omkar-Acharekar wrote:

I didn't create any group as Administrators.

The Administrators group was created automatically by one of the 800,000 files that come pre-installed on your computer.

Secondly, if I want to delete application like Freeform/Chess from MacBook Air

Oh god, not this again

Can you throw some light on it ?

Those two apps account for another 373 of those 800,000 files that come pre-installed on your computer.

The vast majority of these files are read-only and cannot be modified. Otherwise, people would be constantly disabling their systems accidentally.

Here is the method that can be used to restore admin capability to a user when you don't have another admin-capable user.

Restoring Lost Administrator on macOS Son… - Apple Community

You cannot delete built-in Apple Apps.