Had to think about it myself, and you probably mean SID
= User's Security Identifier
To find out what SID belongs to a User name:
Open a Command Prompt by pressing the Windows
key and the R
key at the same time.
In the Run prompt, type: cmd
Now, right-click the following command inside the quote box, and select Copy
wmic useraccount get name,sid
Right-click by the blinking cursor of the Command Prompt, and select: Paste
A list appears with each User account in Windows, listed by User name and followed by its SID.
To explain a little further...what is showing looks like red-circled 'x', which, like Parman
said, the name associated with it was probably removed from the computer
. The deleted account was granted access to the object you are checking.
When the account is deleted the system does not remove the access control list entry.
The red-circled 'x' appears because the system can no longer resolve the SID to an account name, since the account no longer exists.