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Subject: Re: Permissions issues after installing Windows 10
To: cygwin AT cygwin DOT com
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From: Brent Epp <brent AT pdc DOT ca>
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Date: Fri, 3 Jun 2022 07:23:05 -0500
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On 2022-06-02 10:14, Bill Stewart wrote:
> On Thu, Jun 2, 2022 at 6:44 AM Brent Epp wrote:
>
> In the [Security] tab for these files or directories, under "Group or
>> user names", it lists the owner as "Account Unknown(S-...)".  In some
>> cases, these files are completely inaccessible and I can't even take
>> ownership or change the permissions.  I have to either restore them from
>> a backup or boot to a Linux environment to access them.
>>
> Windows displays "Account Unknown" (with a SID) in the ACL when it can't
> resolve the SID reference.
>
> There can be a number of reasons for this. One common reason is that the
> SID belongs to a domain account and the domain is not accessible. Another
> is that the SID belongs to a local account on a different computer (e.g., a
> removable disk is moved between computers and local accounts are in the
> ACL).
This is essentially what happened (removable disk moved from one 
computer to another).

> Well-known SIDs (e.g., S-1-5-32-544 for the local Administrators
> group, etc.) should resolve from any computer.
I would think so too, but that doesn't appear to be happening.If it 
makes a difference, the SID actually starts with S-1-5-21. I have to 
manually take ownership in order to even access the files at all.

  - Brent

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