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It’s therefore obvious that having multiple computers with the same machine SID on a network poses a security risk, right? The reason that I began considering New SID for retirement is that, although people generally reported success with it on Windows Vista, I hadn’t fully tested it myself and I got occasional reports that some Windows component would fail after New SID was used.When I set out to look into the reports I took a step back to understand how duplicate SIDs could cause problems, a belief that I had taken on faith like everyone else.This blog post debunks the myth with facts by first describing the machine SID, explaining how Windows uses SIDs, and then showing that - with one exception - Windows never exposes a machine SID outside its computer, proving that it’s okay to have systems with the same machine SID.Note that Sysprep resets other machine-specific state that, if duplicated, can cause problems for certain applications like Windows Server Update Services (WSUS), so MIcrosoft's support policy will still require cloned systems to be made unique with Sysprep.You can use Ps Get Sid to view the name of the account for a specified SID, and here you can see that the local SID that has a RID of 1000 is for the Abby account, the name of the administrator account Windows prompted me to name during setup: In addition to these dynamically created SIDs, Windows defines a number of accounts that always have predefined SIDs, not just RIDs.One example is the Everyone group, which has the SID S-1-1-0 on every Windows system: Another example, is the Local System account (System), which is the account in which several system processes like Session Manager (Smss.exe), the Service Control Manager (Services.exe) and Winlogon (Winlogon.exe) run: When an account logs on to a Windows system, the Local Security Authority Subsystem (LSASS -Lsass.exe) creates a logon session and a for the session.
You can use the Sysinternals Ps Get Sid tool to view a machine’s SID by running it with no command-line arguments: Here, the revision number is 1, the authority is 5, and there are four subauthority values.
If the computer is part of a Workgroup, then the credentials you specify must be for a local account on the remote system; for a Domain-joined system, the credentials can be for a remote system’s local account or a Domain account.
When you access a file on the share, the file server driver on that system uses the token from the logon session for the permission check, leveraging a mechanism called .
At one point during the design of Windows NT, the machine SID might have been used for network identification, so in order to assure uniqueness, the SID that Setup generates has one fixed subauthority value (21) and three randomly-generated subauthority values (the numbers following “S-1-5-21” in the output).
Even before you create the first user account on a system, Windows defines several built-in users and groups, including the Administrator and Guest accounts.